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ICs for Digital Still Camera
AN2905FHQ
Sound input/output interface IC for digital still camera
I Overview
The AN2905FHQ is a sound input/output interface IC which is optimum for incorporation of sound functions in a digital still camera. The sound pre-processing prior to the digital processing and sound post-processing after DAC are integrated on a single chip. This IC is effective to make the equipment compact.
36 37 9.000.20 7.000.20 25 24
Unit: mm
(0.75)
48 13 (0.75)
0.50
* Functions required for the sound pre- and post-processings are integrated on a single chip * The built-in microphone amp. and microphone power supply * A built-in 0.5 W BTL amp. * Built-in SP power save and electronic volume functions * A beep circuit with electronic volume * A built-in internal microphone amp. on/off function * A built-in AGC switch * A built-in AGC to a speaker amp. (Prevents the sound distortion, trembling sound and wire breakdown of the speaker at excessively high voltage signal input)
0.10 M
(1.00)
0.150.05
Seating plane
0 to 10 0.500.20
LQFP048-P-0707A
I Applications
* Digital still camera (DSC)
I Application Circuit
Power supply for microphone Microphone input Speaker
Recorder output A/D converter
Playback input
D/A converter
Line output Beep input
0.100.20
1.400.10 1.70 max.
I Features
1
12 0.200.05
7.000.20 9.000.20
Publication date: August 2001
SDB00078AEB
1
AN2905FHQ
I Application Circuit Example
47 k 0.47 F 0.47 F 10 k
10 k
31 AGND 100 k 4.7 F
0.47 F
34 VREF
0.47 F
Recorder output
To A/D converter
36
35
33
32
30
29
28
27
26
25
-26 dBS Gain adjustment 37 Det. 38 39 40 41 1 F 10 F VCCH 2V 42 43 44 AGND 45 2.2 F Line output SP power save on/off +4.30 V SP_VCC 46 47 48 SP power save -7 dBS Microphone power supply +28 dB -67 dBS AGC
-12.3 dBS 24 23 10 F 22
Standby changeover
HPF changeover SW Microphone input 0.22 F
VREF
Microphone amp. on/off 21 20 -12.3 dBS 19 18 LPF 17 Vol. CTL Det. 14 13 16 15 AGC VCC +3.10 V
HPF changeover SW Playback input
10 F 0.47 F
0.47 F
From D/A converter AGND EVR_CTL
VREFH
AGC on/off
10 F
+4.90 V
Electronic volume
EVR mute
10 F
+ VREF-SP Electronic volume Vol. CTL
10
11
SP_ GND
10 F
12
1
2
3
4
5
6
7
8
9
AGND
0.1 F 2.2
2
SDB00078AEB
Beep input
6
4.7 F 100 k
0.1 F 2.2
0.47 F
0.47 F
0.47 F
0.47 F
0.47 F
EVR_CTL
AN2905FHQ
I Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Description Speaker output (+) GND (for SP) Speaker output (-) 1/2VCC-SP Speaker amp. input Mix. amp. output GND Beep mix. amp. input Beep electronic volume output Beep electronic volume controll Beep input Playback-system AGC detection pin Mix. amp. input Electronic volume output EVR mute Electronic volume control GND AGC changeover SW Playback input HPF changeover SW VCC Microphone amp. power save SW 1/2VCC (VREF) Standby changeover Pin No. 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Description Recorder output HPF operational amp. input Operational amp. output Operational amp. input Operational amp. input AGC output GND AGC detection pin Wind noise HPF output Wind noise HPF bias output Wind noise HPF operational amp. input Wind noise not through HPF input Microphone amp. negative feedback pin Microphone amp. output SW against wind noise Microphone amp. input Microphone power supply Microphone power supply smoothing pin 1/2VCCH (VREFH) VCCH GND Line output Speaker power save SW VCC-SP (for speaker drive)
I Absolute Maximum Ratings
Parameter Supply voltage
*2
Symbol VCC VCCH /VCC-SP
Rating 3.5 5.2 361 -20 to +70 -55 to +150
Unit V
Supply current Power dissipation
*3 *1
ICC PD Topr Tstg
*1
A mW C C
Operating ambient temperature Storage temperature
Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: When used within the range not exceeding the absolute maximum ratings and the power dissipation. *3: The power dissipation shown is for the independent IC without a heat sink at Ta = 70C.
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AN2905FHQ
I Recommended Operating Range
Parameter Supply voltage Symbol VCCH VCC VCC-SP Range 4.50 to 5.00 2.70 to 3.30 2.70 to 5.00 Unit V
I Electrical Characteristics at VCCH = 4.9 V, VCC-SP = 4.3 V, VCC = 3.1 V, Ta = 25C
Parameter Circuit current Circuit current without signal (1A) (VCC-system) Circuit current without signal (2A) (VCCH-system) Circuit current without signal (3A) (VCC-SP-system) Circuit current without signal (1B) (VCC-system) Circuit current without signal (2B) (VCCH-system) Circuit current without signal (3B) (VCC-SP-system) Circuit current without signal (3C) (VCCH-system) Circuit current without signal (3D) (VCCH-system) Circuit current without signal (1C) (VCC-system) Power supply for microphone Microphone supply voltage VMIC Output current = -5 mA VIN = -37 dBS, 1 kHz 1.8 -9 2.0 -8 0.02 -89 0.02 2.2 -7 0.10 -84 1.0 V Microphone amp. characteristics: Microphone amp. input Microphone amp. output Output level Output THD 1 Output noise Output THD 2 VROM dBS % dBS % THROM1 VIN = -37 dBS, 1 kHz, up to 5th harmonic NROM Without input, using A-curve filter THROM2 VIN = -33 dBS, 1 kHz, up to 5th harmonic VIN = -38 dBS, 1 kHz IVCCA Without signal 2.2 2.8 1.0 3.2 3.8 3.0 0.5 1.8 0.7 3.0 1.8 1.8 4.2 4.8 6.0 1.5 2.8 1.7 4.0 2.8 2.8 mA mA mA mA mA mA mA mA mA Symbol Conditions Min Typ Max Unit
IVCCHA Without signal IVCCSA IVCCB Without signal I/O power save
IVCCHB I/O power save IVCCSB SP power save
IVCCHC SP power save IVCCHD SP, I/O power save IVCCC Microphone amp. off
Rec. AGC characteristics: AGC input Rec. input Rec. reference output level A Rec. reference output THD 1A Rec. output noise voltage A 4 VROA -13.3 -12.3 -11.3 0.01 -81 0.10 -75 dBS % dBS THROA VIN = -38 dBS, 1 kHz, up to 5th harmonic VNROA Without input, using A-curve filter
SDB00078AEB
AN2905FHQ
I Electrical Characteristics at VCCH = 4.9 V, VCC-SP = 4.3 V, VCC = 3.1 V, Ta = 25C (continued)
Parameter Symbol Conditions Min -9.3 -9.0 -8.8 -8.0 -30 Typ -7.3 -6.0 -5.8 0.10 -5.0 0.15 0 Max -5.3 -3.0 -2.8 0.40 -2.0 1.0 30 Unit Rec. AGC characteristics (continued): AGC input Rec. input Microphone AGC characteristics 1 VAGCML1 VIN = -33 dBS, 1 kHz Microphone AGC characteristics 2 VAGCML2 VIN = -28 dBS, 1 kHz Microphone AGC characteristics 3 VAGCML3 VIN = -22 dBS, 1 kHz Microphone AGC characteristics 3 THAGCM3 VIN = -22 dBS, 1 kHz, THD up to 5th harmonic, load = 22 k Microphone AGC characteristics 4 VAGCM4 VIN = -4 dBS, 1 kHz Microphone AGC characteristics 4 THAGCM4 VIN = -4 dBS, 1 kHz, THD up to 5th harmonic, load = 22 k AGC-DC offset voltage VDROM Without input, difference from VREF voltage VLOPS VIN = -12.3 dBS, 1 kHz dBS dBS dBS % dBV % mV
PB line output characteristics: PB input Line output Line reference output level at playback Line reference output THD at playback Line reference output noise voltage at playback Line maximum output level at playback Line crosstalk Mic. input Line output Rec. crosstalk 1 PB input Rec. output Electronic volume maximum (+10 dB) gain Electronic volume typical (0 dB) gain Electronic volume minimum (maximum attenuation) gain -8.0 2.8 -7.0 0.02 -84 6.3 -83 -81 -6.0 0.10 -78 -78 -73 dBS % dBS dBS dBS dBS
THLOPS VIN = -12.3 dBS, 1 kHz, up to 5th harmonic VNOPS Without input, using A-curve filter
VLMAPOS f = 1 kHz, load = 22 k, THD = 1% (up to 5th) VSOPS1 VNOM VIN = -61 dBV, f = 1 kHz, using A-curve filter at PB VIN = -7.3 dBV, f = 1 kHz, using A-curve filter
Electronic volume characteristics: PB input EVR output (AGC = off) VEVMA VIN = -12.3 dBS, 1 kHz, vol. = max. (V16 = 3.1 V) VEVTP VEVMI VIN = -12.3 dBS, 1 kHz, vol. = center (V16 = 1.55 V) VIN = -12.3 dBS, 1 kHz, vol. = min. (V16 = 0 V), using A-curve filter -12.0 -11.0 -10.0 -24.0 -21.0 -18.0 -90 -80 dBS dBS dBS
Playback-system characteristics (at AGC on) Playback AGC characteristics 1 VPBAGC1 VIN = -22.3 dBS, 1 kHz, vol. = max. Playback AGC characteristics 2 VPBAGC2 VIN = -12.3 dBS, 1 kHz, (reference +10 dB) vol. = max. Playback AGC characteristics 3 VPBAGC3 VIN = 0 dBS, 1 kHz, (reference +22.3 dB) vol. = max. Playback AGC characteristics 3 THPBAGC3 VIN = 0 dBS, 1 kHz, (reference +22.3 dB) THD vol. = max., 5th harmonic -20 -12.5 -11.5 -18 -9.5 -8.5 0.85 -16 -6.5 -5.5 1.0 dBS dBS dBS %
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AN2905FHQ
I Electrical Characteristics at VCCH = 4.9 V, VCC-SP = 4.3 V, VCC = 3.1 V, Ta = 25C (continued)
Parameter Symbol Conditions VIN = -14.3 dBS, 1 kHz, vol. = max., beep EVR = min., RL = 6 Min Typ Max Unit Speaker output-system characteristics 1 (at AGC off) SP reference output level at playback SP reference output THD at playback VSPPS 0.0 300 0.0 1.5 0.2 -78 500 -110 1.5 -72 3.0 0.9 -74 -90 3.0 -67 dBS % dBS mW dBS dBS dBS
THSPPS VIN = -14.3 dBS, 1 kHz, vol. = max., beep EVR = min., RL = 6
SP reference output noise voltage VNSPPS Without input, using A-curve filter, at playback vol. = typ., beep EVR = min., RL = 6 SP maximum rating output at playback SP output at power save and playback Beep EVR characteristics 1 (at EVR = max.) Beep EVR characteristics 2 (at EVR = min.) SP reference output level at playback SP reference output THD at playback VMSPPS f = 1 kHz, vol. = max., beep EVR = min., RL = 6 , THD = 10% VPSPPS VBMA VBMI VIN = -14.3 dBS, 1 kHz, vol. = max., using A-curve filter, RL = 6 VIN = -15 dBS, 1 kHz, vol. = min., RL = 6 VIN = -15 dBS, 1 kHz, vol. = min., using A-curve filter, RL = 6 VIN = -12.3 dBS, 1 kHz, vol. = max., beep EVR = min., RL = 6
Speaker output-system characteristics 2 (at AGC on) VSPPS 2.0 5.0 0.2 -72 6.5 0.9 -68 dBS % dBS
THSPPS VIN = -12.3 dBS, 1 kHz, vol. = max., beep EVR = min., RL = 6
SP reference output noise voltage VNSPPS Without input, using A-curve filter, at playback vol. = typ., beep EVR = min., RL = 6 Mode selection hold voltage HPF off hold voltage HPF on hold voltage SP output on hold voltage SP output off hold voltage Standby on hold time Standby off hold time Microphone amp. on hold time Microphone amp. off hold time HPF on hold voltage HPF off hold voltage AGC on hold voltage AGC off hold voltage EVR mute on hold voltage EVR mute off hold voltage V39L V39H V47L V47H V24L V24H V22H V22L V20L V20H V18L V18H V15L V15H
0.0 2.5 0.0 2.6 0.0 2.6 0.0 2.6 0.0 2.6 0.0 2.6 0.0 2.6

0.5 3.1 0.5 4.3 0.5 3.1 0.5 3.1 0.5 3.1 0.5 3.1 0.5 3.1
V V V V V V V V V V V V V V
6
SDB00078AEB
AN2905FHQ
I Technical Data
1. PD Ta curves of LQFP048-P-0707A PD T a
1 400
1 211 1 200 Glass epoxy board: 50 mm x 50 mm x t0.8 mm Rth(j-a) = 103.1C/W
Power dissipation PD (mW)
1 000
800
600 564.6
Independent IC without a heat sink Rth( j-a) = 221.4C/W
400
200
0 0 25 50 75 100 125 150
Ambient temperature Ta (C)
SDB00078AEB
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AN2905FHQ
I Technical Data (continued)
2. Main Characteristics Electronic volume control curve
0 -10
Microphone amp. gain External resistor between pin 37 and pin 38
29 28 100 k 82 k 68 k 27 26 25 24 15 k 23 10 k 22 47 k 33 k 22 k
Electronic volume output level (dBS)
-30 -40 -50 -60 -70 -80 -90 -100 0 1 2 3
Microphone amp. gain (dB)
-20
0
20
40
60
80
100
120
Electronic volume control voltage (V)
External resistor between pin 37 and pin 38 (k)
Maximum power consumption Supply voltage VCC-SP
1 000 900
Maximum power consumption (mW)
800 700 600 500 400 300 200 100 0 0 3.0 4.0 5.0 VCC = 3.1 V VCCH = 4.9 V ROUT = 6 Temp. = 27C AGC: off
Supply voltage VCC-SP (V)
8
SDB00078AEB
Request for your special attention and precautions in using the technical information and semiconductors described in this material
(1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuit examples of the products. It does not constitute the warranting of industrial property, the granting of relative rights, or the granting of any license. (3) The products described in this material are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: * Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. * Any applications other than the standard applications intended. (4) The products and product specifications described in this material are subject to change without notice for reasons of modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (5) When designing your equipment, comply with the guaranteed values, in particular those of maximum rating, the range of operating power supply voltage and heat radiation characteristics. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, redundant design is recommended, so that such equipment may not violate relevant laws or regulations because of the function of our products. (6) When using products for which dry packing is required, observe the conditions (including shelf life and after-unpacking standby time) agreed upon when specification sheets are individually exchanged. (7) No part of this material may be reprinted or reproduced by any means without written permission from our company.
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2001 MAR

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