CXA1946

Manufacturer Part NumberCXA1946
DescriptionElectronic Volume
ManufacturerSONY [Sony Corporation]
CXA1946 datasheet
 
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Page 1/24

Download datasheet (369Kb)Embed
Next
Electronic Volume
For the availability of this product, please contact the sales office.
Description
The CXA1946AQ/AR is a serial control electronic
volume IC designed for use in audio systems.
Features
• Loudness
• Volume control (0dB to –87dB in 1dB step, –∞dB)
• Balance
• Tone control (15 steps, 2 bands, –16dB to +16dB)
• Fader
(2dB-step to –20dB, –25dB, –35dB, –45dB, –60dB, –∞dB)
• Input selector (4 channels)
• Gain can be set for each input channel (common for channels 3 and 4)
• Serial data control (DATA, CLK, CE)
• Single 8V power supply
• Zero-cross detection circuit (with timer)
• Power-off mute
• Volume control and tone control input/output pins are separate.
Absolute Maximum Ratings
• Supply voltage
• Operating temperature
• Storage temperature
• Allowable power dissipation
Operating Conditions
Supply voltage
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXA1946AQ/AR
48 pin QFP (Plastic)
V
13
CC
Topr
–40 to +85
Tstg
–65 to +150
P
QFP
350
D
LQFP
180
V
6 to 12
CC
– 1 –
48 pin LQFP (Plastic)
V
°C
°C
mW (Ta = 85°C)
mW (Ta = 85°C)
V
E95602D7Y

CXA1946 Summary of contents

  • Page 1

    ... Electronic Volume For the availability of this product, please contact the sales office. Description The CXA1946AQ/ serial control electronic volume IC designed for use in audio systems. Features • Loudness • Volume control (0dB to –87dB in 1dB step, –∞dB) • Balance • Tone control (15 steps, 2 bands, –16dB to +16dB) • ...

  • Page 2

    ... STEP 1dB STEP VOLUME VOLUME VCTBUFF VCTBUFF VCTBUFF LATCH LATCH CONTROL SHIFT REGISTER VCTBUFF VCTBUFF VCTBUFF VOLUME VOLUME 8dB STEP 1dB STEP – 2 – CXA1946AQ/ FADER TONE 100k 100k TONE FADER FNTO1 24 REO1 CLK 21 ...

  • Page 3

    ... INAO2 — 33 INAO1 VCT Equivalent circuit GND GND GND GND – 3 – CXA1946AQ/AR Description Sets gain for IN3 and IN4. Sets loudness low cut-off frequency. Sets loudness high cut-off frequency. Input selector output ...

  • Page 4

    ... VOUT2 — 31 VOUT1 VCT 7 TIN2 19kΩ 30 TIN1 VCT 8 TCHC2 5kΩ 29 TCHC1 VCT Equivalent circuit GND GND GND GND – 4 – CXA1946AQ/AR Description Volume input Volume output Tone input Sets tone high frequency. ...

  • Page 5

    ... VCT 11 TCO2 — 26 TCO1 VCT 12 FDIN2 24kΩ 25 FDIN1 VCT Equivalent circuit GND GND GND GND – 5 – CXA1946AQ/AR Description Sets tone low frequency. Sets tone low frequency. Tone control output Fader input ...

  • Page 6

    ... Pin voltage 13 FNTO2 — 24 FNTO1 VCT 14 REO2 — 23 REO1 VCT — 15 TIMER — ∞ ~ – 16 DATA — Equivalent circuit GND GND GND GND – 6 – CXA1946AQ/AR Description Front output Rear output Sets timer. Serial data input ...

  • Page 7

    ... CE — ∞ ~ – 37 GAIN12 48 GAIN22 VCT Equivalent circuit GND GND GND – 7 – CXA1946AQ/AR Description Center electric potential + power supply GND Digital GND Serial clock input Latch enable input Sets gain for IN2. ...

  • Page 8

    ... Pin I/O resistance Symbol No. Pin voltage 38 GAIN11 ∞ ~ – 47 GAIN21 39 IN14 40 IN13 41 IN12 42 IN11 50kΩ 43 IN21 VCT 44 IN22 45 IN23 46 IN24 Equivalent circuit GND GND – 8 – CXA1946AQ/AR Description Sets gain for IN1. Signal input ...

  • Page 9

    ... D8 D9 D10 D11 VRF1 D12 D13 D14 VRC2 D15 D16 D17 VRF2 D18 D19 D20 D21 TONE BASS D22 D23 D24 D25 TONE TREBLE D26 D27 D28 D29 FADER D30 D31 LAST BIT D32 FADER SELECT MSB LSB – 9 – CXA1946AQ/AR ...

  • Page 10

    ... D8/D15 D9/D16 D12/D19 – 10 – CXA1946AQ/AR ...

  • Page 11

    ... REAR D22/D26 D30 D31 D32 1 0 – 11 – CXA1946AQ/AR ...

  • Page 12

    ... Glb 100Hz, VRC = –16dB Glh 10kHz, VRC = –16dB Gbb Gbc Gtb Gtc Vsl DATA, CLK, CE Vsh IN11 to 14, IN21 to 24, VRIN1, VRIN2, Vin TIN1, TIN2, FDIN1, FDIN2 – 12 – CXA1946AQ/AR Min. Typ. Max. Unit — — 0.005 0.01 % — µVrms 8 — ...

  • Page 13

    ... V6 10µ 10µ 10µ AC 0.39µ 10µ 10µ 10µ – 13 – CXA1946AQ/AR OP AMP OFF S5 220p V5 AC FNTO1 24 10k REO1 23 10k CLK 21 1k DGND 20 GND ...

  • Page 14

    ... CXA1946AQ/AR 0.39µ 10µ FNTO1 REO1 CLK 21 DGND 20 GND 19 33µ VCT 17 10µ DATA 16 ...

  • Page 15

    ... CXA1946AQ/AR 0.39µ 10µ FNTO1 24 REO1 CLK 21 DGND 20 GND 19 33µ VCT 17 10µ ...

  • Page 16

    ... Tone control characteristics 1k Frequency [Hz] Loudness characteristics 1k Frequency [Hz] – 16 – CXA1946AQ/AR +16dB 0dB –16dB 10k 100k VRC = 0dB VRC = –8dB VRC = –16dB VRC = –24dB 10k 100k ...

  • Page 17

    ... Description of Operation The CXA1946AQ/ serial control electronic volume IC designed for use in audio systems. The internal circuit of the IC consists of the following blocks: 1. Input selector 2. Volume 3. Loudness 4. Tone control 5. Fader 6. VCT buffer 7. Serial data I/O 8. Zero-cross detector (with timer) 9. Power-off mute The operation of each block and notes on their use are described below. ...

  • Page 18

    ... LDLCX 0.047µ LDLCX VCT GAINX34 50k 50k 50k 50k Fig. 2. Input Selector (2) 20k Total 40k OFF ON LOUD R1 6.18k Loudness Fig. 3. Volume and Loudness – 18 – CXA1946AQ/AR INAOX and C are connected externally, LDHCX LDLCX Loudness frequency characteristics VOUTX Volume ...

  • Page 19

    ... Fig. 5.) Furthermore, the maximum treble boost and cut can be made smaller than in the Application Circuit by connecting an external resistance to C these methods are used, variations in the absolute value of the CXA1946A internal resistance (±20% max.) and in the external resistance will cause variations in the tone control characteristics. Set these constants after studying all considerations carefully ...

  • Page 20

    ... C TCLCX2 RexA TCLCX2 (A) 10k 10k 10k 10k R3 5k TCHCX RexC C TCHCX FDINX (input impedance 24k ) Center ATT Center ATT Fig. 7. Fader – 20 – CXA1946AQ/AR C TCLCX2 TCLCX1 TCLCX2 (B) FNTOX REOX RexB ...

  • Page 21

    ... The serial data has a 32-bit structure as indicated in the specifications. Data input is conducted using three inputs: DATA, CLK, and CE. DATA is shifted in the CXA1946A internal shift register at the rising edge of CLK. The data in the shift register is latched at the falling edge of CE. Refer to this specification for details on the timing ...

  • Page 22

    ... Typ. Max. 5µs 9µs 50µs 90µs 500µs 900µs 5ms 9ms 50ms 90ms 500ms 900ms – 22 – Thi d t CXA1946AQ/AR D32 Invalid ...

  • Page 23

    ... This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). t 48PIN QFP (PLASTIC) 15.3 ± 0.4 + 0.4 12.0 – 0 0.15 0.8 0.3 – 0.1 ± 0.12 M PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT QFP-48P-L04 LEAD MATERIAL QFP048-P-1212-B PACKAGE WEIGHT – 23 – CXA1946AQ/AR + 0.1 0.15 – 0.05 0.15 + 0.2 0.1 – 0.1 + 0.35 2.2 – 0.15 EPOXY RESIN SOLDER / PALLADIUM PLATING COPPER / 42 ALLOY 0.7g ...

  • Page 24

    ... EIAJ CODE JEDEC CODE 48PIN LQFP (PLASTIC (0.22 0.05 0.127 – 0.02 + 0.2 1.5 – 0.1 0.1 ± 0.1 NOTE: Dimension “ ” does not include mold protrusion. PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT – 24 – CXA1946AQ/AR 0.1 EPOXY / PHENOL RESIN SOLDER PLATING 42 ALLOY 0.2g ...