SSM2164SZ Analog Devices Inc, SSM2164SZ Datasheet - Page 10

• Manufacturer Part Number: SSM2164SZ
• Description: IC AMP AUDIO QUAD CLASSAB 16SOIC
• Manufacturer: Analog Devices Inc
• Type: Var Gain Ampr

Specifications of SSM2164SZ

• Amplifier Type: Audio
• Number Of Circuits: 4
• Current - Input Bias: 10nA
• Current - Supply: 6mA
• Voltage - Supply, Single/dual (±): 8 V ~ 36 V, ±4 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• No. Of Amplifiers: 4
• Bandwidth: 500kHz
• No. Of Channels: 1
• Supply Voltage Range: ± 4V To ± 18V
• Amplifier Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Number Of Channels: 4
• Number Of Elements: 4
• Power Supply Requirement: Dual
• Voltage Gain Db: 20dB
• Unity Gain Bandwidth Product (typ): 500KHz
• Input Resistance: 0.005@±15VMohm
• Input Bias Current: 0.01@±15VnA
• Single Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (typ): ±5/±9/±12/±15V
• Power Supply Rejection Ratio: 90dB
• Rail/rail I/o Type: No
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): ±4V
• Dual Supply Voltage (max): ±18V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: SOIC N
• Current, Input Bias: ±10 nA
• Current, Supply: 6 mA
• Harmonic Distortion: 0.3 %
• Impedance, Thermal: 92 °C/W
• Number Of Amplifiers: Quad
• Slew Rate: 0.7
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Supply: ±4 to ±18 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -
• Slew Rate: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -
• Lead Free Status / Rohs Status: Compliant

SSM2164
Single Supply Operation
The SSM2164 can easily be operated from a single power
supply as low as +8 V or as high as +36 V. The key to using a
single supply is to reference all ground connections to a voltage
midway between the supply and ground as shown in Figure 27.
The OP176 is used to create a pseudo-ground reference for the
SSM2164. Both the OP482 and OP176 are single supply
amplifiers and can easily operate over the same voltage range as
the SSM2164 with little or no change in performance.
The reference voltage is set by the resistor divider from the
positive supply. Two 10 k resistors create a voltage equal to
the positive supply divided by 2. The 10 F capacitor filters the
supply voltage, providing a low noise reference to the circuit.
This reference voltage is then connected to the GND pin of the
SSM2164 and the noninverting inputs of all the output amplifi-
ers. It is important to buffer the resistor divider with the OP176
to ensure a low impedance pseudo-ground connection for the
SSM2164.
The input can either be referenced to this same mid-supply
voltage or ac coupled as is done in this case. If the entire system
is single supply, then the input voltage will most likely already
be referenced to the midpoint; if this is the case, the 10 F
input capacitor can be eliminated. Unity gain is set when V
equals the voltage on the GND pin. Thus, the control voltage
should also be referenced to the same midsupply voltage.
The value of the MODE setting resistor may also change
depending on the total supply voltage. Because the GND pin is
at a pseudo-ground potential, the equation to set the MODE
current now becomes:
The value of 1.8 k results in Class A biasing for the case of
using a +8 V supply.
V
IN
Figure 27. Single Supply Operation of the SSM2164
(One Channel Shown)
(0dB GAIN AT V
10µF
30k
560pF
500
V
C
I
C
MODE
=
V+
2
)
(V ) V
V+ = +8V
OP482 AMPLIFIERS
16
V+
9
TO ADDITIONAL
V–
MODE
GND
8
1
GND
R
R
B
B
V+/2
(1.8k FOR
(OPEN FOR
CLASS A)
CLASS B)
0.6V
OP482
30k
1/4
OP176
V+
V+
100pF
10k
V+
10k
V
OUT
C
10µF
–10–
Upgrading SSM2024 Sockets
The SSM2164 is intended to replace the SSM2024, an earlier
generation quad VCA. The improvements in the SSM2164
have resulted in a part that is not a drop-in replacement to the
SSM2024, but upgrading applications with the SSM2024 is a
simple task. The changes are shown in Figure 28. Both parts
have identical pinouts with one small exception. The MODE
input (Pin 1) does not exist on the SSM2024. It has fixed
internal biasing, whereas flexibility was designed into the
SSM2164. A MODE set resistor should be added for Class A
operation, but if the SSM2164 is going to be operated in Class
AB, no external resistor is needed.
Since both parts are current output devices, the output configu-
ration is nearly identical, except that the 10 k resistors should
be increased to 30 k to operate the SSM2164 in its optimum
range. The 10 k input resistor for the SSM2024 should also
be increased to 30 k to match the output resistor. Addition-
ally, the 200
series with 560 pF for the SSM2164 circuit.
One last change is the control port configuration. The
SSM2024’s control input is actually a current input. Thus, a
resistor was needed to change the control voltage to a current.
This resistor should be removed for the SSM2164 to provide a
direct voltage input. In addition, the SSM2024 has a log/log
control relationship in contrast to the SSM2164’s linear/log gain
constant. The linear input is actually much easier to control,
but the difference may necessitate adjusting a SSM2024 based
circuit’s control voltage gain curve. By making these relatively
simple changes, the superior performance of the SSM2164 can
easily be realized.
Figure 28. Upgrading SSM2024 Sockets with SSM2164
V
V
IN1
IN1
560pF
V
10k
V
30k
C1
C1
200
500
resistor should be replaced by a 500
10k
2
2
3
3
SSM2164
SSM2024
16
16
9
9
V+
V+
V–
V–
NC
8
8
1
1
R
B
4
4
10k
30k
V
V
resistor in
OUT1
OUT1
REV. 0