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SSM2135SZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
SSM2135
Rev. G | Page 12 of 16
Single Supply Differential Line Driver
Signal distribution and routing is often required in audio systems,
particularly portable digital audio equipment for professional
applications. Figure 35 shows a single-supply line driver circuit
that has differential output. The bottom amplifier provides a
2 V dc bias for the differential amplifier to maximize the output
swing range. The amplifier can output a maximum of 0.8 V rms
signal with a 5 V supply. It is capable of driving into 600 Ω line
termination at a reduced output amplitude.
5V
1/2
SSM2135
1/2
SSM2135
AUDIO IN
100µF
1kΩ
DIFFERENTIAL
AUDIO OUT
5V
1/2
SSM2135
1kΩ
2.5kΩ
100Ω
5V
7.5kΩ
5kΩ
1µF
0.1µF
2V
10kΩ
1kΩ
10µF + 0.1µF
00349-036
Figure 35. Single-Supply Differential Line Driver
Single-Supply Differential Line Receiver
Receiving a differential signal with minimum distortion is
achieved using the circuit in Figure 36. Unlike a difference
amplifier (a subtractor), the circuit has a true balanced input
impedance regardless of input drive levels; that is, each input
always presents a 20 kΩ impedance to the source. For best
common-mode rejection performance, all resistors around the
differential amplifier must be very well matched. Best results
can be achieved using a 10 kΩ precision resistor network.
1/2
SSM2135
AUDIO
OUT
1/2
SSM2135
20k
Ω
5V
5V
1/2
SSM2135
DIFFERENTIAL
AUDIO IN
100Ω
5kΩ
1µF
0.1µF
2.5kΩ
5V
7.5kΩ
10Ω
10µF
20kΩ
20kΩ
2V
20kΩ
20kΩ
10µF + 0.1µF
00349-037
Figure 36. Single-Supply Balanced Differential Line Receiver
Pseudoreference Voltage Generator
For single-supply circuits, a reference voltage source is often
required for biasing purposes or signal offsetting purposes. The
circuit in Figure 37 provides a supply splitter function with low
output impedance. The 1 μF output capacitor serves as a charge
reservoir to handle a sudden surge in demand by the load as
well as providing a low ac impedance to it. The 0.1 μF feedback
capacitor compensates the amplifier in the presence of a heavy
capacitive load, maintaining stability.
The output can source or sink up to 12 mA of current with a
5 V supply, limited only by the 100 Ω output resistor. Reducing
the resistance increases the output current capability. Alternatively,
increasing the supply voltage to 12 V also improves the output
drive to more than 25 mA.
1/2
SSM2135
V
+ = 5V TO 12V
R3
2.5kΩ
R4
100kΩ
R2
5kΩ
R1
5kΩ
C1
0.1µF
V+
2
OUTPUT
C2
1µF
0349-038
Figure 37. Pseudoreference Generator
SSM2135
Rev. G | Page 13 of 16
Digital Volume Control Circuit Logarithmic Volume Control Circuit
Working in conjunction with the AD7528 dual 8-bit DAC,
the SSM2135 makes an efficient audio attenuator, as shown in
Figure 38. The circuit works off a single 5 V supply. The DACs
are biased to a 2 V reference level, which is sufficient to keep
the internal R-2R ladder switches of the DACs operating prop-
erly. This voltage is also the optimal midpoint of the SSM2135
common-mode and output swing range. With the circuit as
shown in Figure 38, the maximum input and output swing is
1.25 V rms. Total harmonic distortion measures a respectable
0.01% at 1 kHz and 0.1% at 20 kHz. The frequency response at
any attenuation level is flat to 20 kHz.
Figure 39 shows a logarithmic version of the volume control
function. Similar biasing is used. With an 8-bit bus, the AD7111
provides an 88.5 dB attenuation range. Each bit resolves a 0.375 dB
attenuation. Refer to the AD7111 data sheet for attenuation levels
for each input code.
I
OUT
DATA IN
AND
CONTROL
LEFT AUDIO
IN
RIGHT AUDIO
IN
V
DD
DGND
5V
0.1µF
AGND
I
OUT
R
FB
V
DD
DGND
V
IN
AD7111
3
5V
0.1µF
3
14
14
16
16
10
10
10
47µF
47µF
R
FB
AGND
V
IN
D1
D1
AD7111
5V
1/2
SSM2135
1/2
SSM2135
47µF
2kΩ
5V
2V
7.5kΩ
5kΩ
100Ω
0.1µF
1µF
2V
1/2
SSM2135
5V
47µF
1
2
1
2
RIGHT AUDIO
OUT
LEFT AUDIO
OUT
10µF + 0.1µF
00349-041
Each DAC can be controlled independently via the 8-bit parallel
data bus. The attenuation level is linearly controlled by the
binary weighting of the digital data input. Total attenuation
ranges from 0 dB to 48 dB.
5V
1/2
SSM2135
1/2
SSM2135
5V
10µF + 0.1µF
6
DAC A/
DAC B
1/2
SSM2135
V
REF
A
DAC A
OUT A
R
FB
A
V
REF
B
DACB
R
FB
B
OUT B
DATA IN
15
CS
16
WR
18
CONTROL
SIGNAL
LEFT
AUDIO IN
RIGHT
AUDIO IN
V
DD
DGND
17 5
5V
0.1µF
AD7528
3
2
19
20
1
RIGHT AUDIO
OUT
LEFT AUDIO
OUT
47µF
47µF
2kΩ
5V
2V
7.5kΩ
5kΩ
100Ω
0.1µF
1µF
2V
0
0349-040
Figure 39. Single-Supply Logarithmic Volume Control
Figure 38. Digital Volume Control
SSM2135
Rev. G | Page 14 of 16
OUTLINE DIMENSIONS
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-012-AA
012407-A
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 40. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model
1
Temperature Range Package Description Package Option
SSM2135S −40°C to +85°C 8-Lead SOIC_N R-8
SSM2135S-REEL −40°C to +85°C 8-Lead SOIC_N R-8
SSM2135S-REEL7 −40°C to +85°C 8-Lead SOIC_N R-8
SSM2135SZ −40°C to +85°C 8-Lead SOIC_N R-8
SSM2135SZ-REEL −40°C to +85°C 8-Lead SOIC_N R-8
SSM2135SZ-REEL7 −40°C to +85°C 8-Lead SOIC_N R-8
1
Z = RoHS Compliant Part.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

SSM2135SZ-REEL

Mfr. #:
Buy SSM2135SZ-REEL
Manufacturer:
Analog Devices Inc.
Description:
Audio Amplifiers IC DUAL SGL-SUPPLY 4-36V
Lifecycle:
New from this manufacturer.
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