cxa1946br Sony Electronics, cxa1946br Datasheet

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cxa1946br

Manufacturer Part Number
cxa1946br
Description
Electronic Volume
Manufacturer
Sony Electronics
Datasheet
For the availability of this product, please contact the sales office.
Description
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
• 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.
• Portable phone noise countermeasure
Absolute Maximum Ratings
• Supply voltage
• Operating temperature
• Storage temperature
• Allowable power dissipation
Operating Conditions
The CXA1946BQ/BR is a serial control electronic
(2dB-step to –20dB, –25dB, –35dB, –45dB, –60dB, – dB)
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.
Electronic Volume
V
Topr
Tstg
P
V
CC
D
CC
–65 to +150
–40 to +85
6 to 12
350
13
CXA1946BQ/BR
– 1 –
mW (Ta = 85°C)
°C
°C
V
V
48 pin QFP (Plastic)
48 pin LQFP (Plastic)
E96X03A7Y

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cxa1946br Summary of contents

Page 1

Electronic Volume For the availability of this product, please contact the sales office. Description The CXA1946BQ/ serial control electronic volume IC designed for use in audio systems. Features • Loudness • Volume control (0dB to –87dB in 1dB ...

Page 2

Block Diagram and Pin Configuration GAIN12 37 LOUD GAIN11 38 IN14 39 IN13 40 IN12 41 IN11 42 ZCDET IN21 43 IN22 44 IN23 45 IN24 46 GAIN21 47 LOUD GAIN22 ...

Page 3

Pin Description Pin I/O resistance Symbol No. Pin voltage ~ – 1 GAIN234 36 GAIN134 VCT 2 LDLC2 6.18k 35 LDLC1 VCT 3 LDHC2 8.92k 34 LDHC1 VCT 4 INAO2 — 33 INAO1 VCT Equivalent circuit ...

Page 4

Pin I/O resistance Symbol No. Pin voltage 5 VRIN2 9.5k 32 VRIN1 VCT 6 VOUT2 — 31 VOUT1 VCT 7 TIN2 19k 30 TIN1 VCT 8 TCHC2 5k 29 TCHC1 VCT Equivalent circuit GND V CC ...

Page 5

Pin I/O resistance Symbol No. Pin voltage 9 TCLC21 8k 28 TCLC11 VCT 10 TCLC22 8k 27 TCLC12 VCT 11 TCO2 — 26 TCO1 VCT 12 FDIN2 24k 25 FDIN1 VCT Equivalent circuit GND V CC ...

Page 6

Pin I/O resistance Symbol No. Pin voltage 13 FNTO2 — 24 FNTO1 VCT 14 REO2 — 23 REO1 VCT — 15 TIMER — ~ – 16 DATA — Equivalent circuit GND GND ...

Page 7

Pin I/O resistance Symbol No. Pin voltage — 17 VCT VCT GND GND 19 — 20 DGND ~ – 21 CLK — ~ – — ~ – 37 GAIN12 48 GAIN22 VCT Equivalent ...

Page 8

Pin I/O resistance Symbol No. Pin voltage 38 GAIN11 ~ – 47 GAIN21 39 IN14 40 IN13 41 IN12 42 IN11 50k 43 IN21 VCT 44 IN22 45 IN23 46 IN24 Equivalent circuit GND V CC ...

Page 9

Data Format (a) Data allocation FAST BIT D1 NOP D2 D3 ISW D4 D5 LOUD D6 D7 VRC1 D8 D9 D10 D11 VRF1 D12 D13 D14 VRC2 D15 D16 D17 D18 VRF2 D19 D20 D21 TONE BASS D22 D23 D24 ...

Page 10

Setting table • NOP D2 Setting value D1 — • ISW D4 Setting value D3 IN14/IN24 1 1 IN13/IN23 0 1 IN12/IN22 0 1 IN11/IN21 0 0 • LOUD D5 Setting value OFF • ...

Page 11

TONE BASS/TREBLE D21/D25 Setting value D20/D24 • BOOST/CUT D23/D27 Setting value BOOST 1 0 CUT ...

Page 12

Electrical Characteristics Item Current consumption Total harmonic distortion Output noise voltage Maximum output voltage Separation Volume maximum attenuation Low Loudness High Bass max. boost gain Bass max. cut gain Treble max. boost gainn Treble max. cut gain Low Input voltage ...

Page 13

Electrical Characteristics Measurement Circuit 10k 10k 10k GAIN12 GAIN11 38 B S14 IN14 A 39 V14 10k AC B S13 40 IN13 A V13 10k AC B S12 IN12 41 A V12 AC 10k B S11 ...

Page 14

Application Circuit 1 0.047µ GAIN12 GAIN11 38 IN14 39 40 IN13 IN12 41 IN11 42 IN21 43 IN22 44 IN23 45 IN24 46 GAIN21 47 GAIN22 0.047µ Application circuits shown are typical examples illustrating ...

Page 15

Application Circuit GAIN12 38 GAIN11 39 IN14 IN13 40 IN12 41 IN11 42 IN21 43 IN22 44 IN23 45 IN24 46 GAIN21 47 GAIN22 Application circuits shown are typical examples illustrating the operation ...

Page 16

Tone control characteristics 1k Frequency [Hz] Loudness characteristics 1k Frequency [Hz] – 16 – CXA1946BQ/BR +16dB 0dB –16dB 10k ...

Page 17

Description of Operation The CXA1946BQ/ 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. ...

Page 18

GAINX2 GAINX1 INX4 INX3 INX2 INX1 2. Volume The volume circuit consists of two sections, an 8dB/step section and a 1dB/step section, as shown in Fig. 3. This circuit also serves as a balance control because the volume for channel ...

Page 19

Tone control The configuration of the tone control circuit is shown in Fig externally, and the tone control frequency characteristics can be changed by changing these constants. The relationships between C TCLCX2 1 ...

Page 20

TCLCX1 R4 8k TINX Fig. 5. Method for Reducing Bass Boost/Cut Fig. 6. Method for Reducing Treble Boost/Cut 5. Fader The configuration of the fader circuit is shown in Fig. 7. The fader operates by specifying the amount of attenuation ...

Page 21

VCT buffer The internal circuit for the VCT pin is shown in Fig. 8. This circuit generates the electric potential for the center between Vcc and GND (Vcc/2). The IC internal operation reference potential is equal to the output ...

Page 22

Connections and Characteristics of Each Block In the Application Circuit, the signal path goes from the input selector to the volume (+loudness) to the tone control to the fader. The sequence of the blocks in the signal path can be ...

Page 23

... Package Outline Unit: mm CXA1946BQ SONY CODE EIAJ CODE JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). CXA1946BR 37 48 0.5 ± 0.08 SONY CODE EIAJ CODE JEDEC CODE 48PIN QFP (PLASTIC) 15.3 ± 0.4 + 0.4 12.0 – 0 ...

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