SSM2166SZ Analog Devices Inc, SSM2166SZ Datasheet - Page 13

• Manufacturer Part Number: SSM2166SZ
• Description: Audio Amp Microphone 1-CH Mono Class-AB 14-Pin SOIC N
• Manufacturer: Analog Devices Inc

Specifications of SSM2166SZ

• Package: 14SOIC N
• Function: Microphone
• Amplifier Type: Class-AB
• Typical Voltage Gain: 60 dB
• Total Harmonic Distortion Noise: 0.25@100000Ohm %
• Typical Psrr: 50 dB
• Typical Gain Bandwidth Product: 30 MHz
• Maximum Load Resistance: 100000 Ohm
• Output Type: 1-Channel Mono
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Microphone
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Bandwidth: 20 kHz
• Current, Supply: 7.5 mA
• Harmonic Distortion: 0.25 %
• Impedance, Thermal: 120 °C/W
• Package Type: SOIC-14
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Input: 1 V
• Voltage, Noise: 17 nV/sqrt Hz
• Voltage, Supply: 4.5 to 5.5 V
• No. Of Channels: 1
• Supply Voltage Range: 4.5V To 5.5V
• Load Impedance: 75ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: SOIC
• No. Of Pins: 14
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

EVALUATION BOARD
A schematic diagram of the SSM2166 evaluation board is
illustrated in Figure 26. As a design aid, the layouts for the
topside silkscreen and the topside and backside metallization
layers are shown in Figure 27, Figure 28, and Figure 29. Although
not shown to scale, the finished dimension of the evaluation
board is 3.5 inches by 3.5 inches and comes complete with pin
sockets and a sample of the SSM2166.
Signal sources are connected to the SSM2166 through a 1/8-inch
phone jack where a 0.1 μF capacitor couples the input signal
to the AUDIO +IN pin (Pin 7). As shown in Figure 26 and in
microphone applications, the phone jack shield can be optionally
connected to the ground plane of the board (Jumper J1 inserted
into the board socket for Pin 1 and Pin 2) or to the VCA
at Pin 4 (J1 inserted into the board socket for Pin 1 and Pin 3).
If the signal source is a waveform or function generator, the
phone jack shield should be connected to ground.
For ease in making adjustments for all configuration parameters,
single-turn potentiometers are used throughout. Optional
Jumper J2 connects the COMP RATIO SET pin to ground and
sets the SSM2166 for no compression (that is, compression ratio
= 1:1). Optional Jumper J3 connects the POWER DOWN (Pin
12) input to ground for normal operation. J3 can be replaced by
an open-drain logic buffer for a digitally controlled shutdown
function. An output signal mute function can be implemented
10kΩ
1µF
C2
R2
PWR
MIC
10kΩ
R1
PHONE
6
INPUT
JACK
BUF OUT
–IN
1/8"
AUDIO +IN
5
10µF
7
C6
1
2
C1
0.1µF
+
VCA
3
3
IN
VCA
4
ROTATION
R
+
SET
Figure 26. Evaluation Board Schematic
11
C7
10µF
AVG CAP
500Ω
R
R4
input
8
+
C4
22µF
Rev. D | Page 13 of 20
ROTATION
50kΩ
PT ADJ
GAIN
ADJ
R3
GAIN ADJUST
1kΩ
CW
R9
SSM2166
CW
2
0.1µF
R10
20kΩ
C3
330Ω
R11
+V
on the SSM2166 by connecting the GAIN ADJUST pin (Pin 2)
through a 330 Ω resistance to ground. This is provided on the
evaluation board via R11 and S1. Capacitor C5, connected
between Pin 2 and ground and provided on the evaluation
board, can be used to avoid audible clicks when using the mute
function.
To configure the SSM2166 input buffer for gain, provisions for
R1, R2, and C2 have been included. To configure the input buffer
for unity-gain operation, R1 and R2 are removed and a direct
connection is made between the −IN pin (Pin 6) and the BUF OUT
pin (Pin 5).
The output stage of the SSM2166 is capable of driving >1 V rms
(3 V p-p) into >5 kΩ loads and is externally available through
an RCA phono jack provided on the board. If the output of the
SSM2166 is required to drive a lower load resistance or an audio
cable, the on-board
insert Jumper J4 into the board socket for Pin 4 and Pin 5 and
insert Jumper J5 into the board socket for Pin 6 and Pin 7. If the
output buffer is not required, remove Jumper J5 and insert Jumper
J4 into board socket Pin 5 and Pin 7.
There are no blocking capacitors either on the input or at
the output of the buffer. As a result, the output dc level of the
buffer matches the output dc level of the SSM2166, which is
approximately 2.3 V. A dc blocking capacitor can be inserted at
Pin 6 and Pin 7. An evaluation board and setup procedure
is available from a Analog Devices, Inc., sales representative.
V+
14
1MΩ
R7
MUTE
SWITCH
CCW
C5
0.01µF
NOISE GATE ADJ
COMP RATIO SET
100kΩ
500Ω
NOISE GATE
R8
CW
R6
SET
10
9
OP113
COMP
RATIO
ADJ
POWER DOWN
OP113
can be used. To use the OP113 buffer,
OUTPUT
12
R12
100kΩ
13
GND
5
4
6
7
J3
OUTPUT
JACK
RCA
PHONO
1
SSM2166