SSM2135S Analog Devices Inc, SSM2135S Datasheet - Page 12

• Manufacturer Part Number: SSM2135S
• Description: IC AMP AUDIO STER CLASS AB 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of SSM2135S

• Slew Rate: 0.9 V/µs
• Mounting Type: Surface Mount
• Rohs Status: RoHS non-compliant
• Amplifier Type: Audio
• Number Of Circuits: 1
• Gain Bandwidth Product: 3.5MHz
• Current - Input Bias: 300nA
• Voltage - Input Offset: 200µV
• Current - Supply: 3.7mA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 4 V ~ 36 V, ±2 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 2
• Bandwidth: 3.5MHz
• No. Of Pins: 8
• Gain: 126dB
• Supply Voltage Min: 4V
• Peak Reflow Compatible (260 C): No
• Input Bias Current: 300nA
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SSM2135
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.
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.
DIFFERENTIAL
AUDIO IN
AUDIO IN
Figure 36. Single-Supply Balanced Differential Line Receiver
100µF
10kΩ
Figure 35. Single-Supply Differential Line Driver
20kΩ
20kΩ
2V
1kΩ
1µF
SSM2135
1µF
5V
20kΩ
1/2
SSM2135
SSM2135
10µF + 0.1µF
0.1µF
100Ω
1kΩ
5V
2.5kΩ
1/2
1/2
1kΩ
2V
10µF + 0.1µF
100Ω
2.5kΩ
20kΩ
SSM2135
SSM2135
1/2
5V
0.1µF
1/2
20kΩ
SSM2135
1/2
5V
DIFFERENTIAL
AUDIO OUT
5V
10Ω
7.5kΩ
5kΩ
10µF
7.5kΩ
5kΩ
AUDIO
OUT
5V
Rev. G | Page 12 of 16
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.
5kΩ
5kΩ
R1
R2
V+ = 5V TO 12V
Figure 37. Pseudoreference Generator
SSM2135
1/2
0.1µF
C1
2.5kΩ
R3
100kΩ
R4
C2
1µF
V+
2
OUTPUT