SSM2019BRNZ Analog Devices Inc, SSM2019BRNZ Datasheet - Page 6

• Manufacturer Part Number: SSM2019BRNZ
• Description: Audio Amp Microphone 1-CH Mono Class-AB 8-Pin SOIC N
• Manufacturer: Analog Devices Inc
• Type: Class ABr

Specifications of SSM2019BRNZ

• Package: 8SOIC N
• Function: Microphone
• Amplifier Type: Class-AB
• Input Signal Type: Differential
• Typical Voltage Gain: 70 dB
• Total Harmonic Distortion Noise: 0.0035@2000Ohm %
• Typical Psrr: 124 dB
• Output Signal Type: Single
• Maximum Input Bias Current: 3(Typ)@±15V uA
• Maximum Input Offset Voltage: 0.05(Typ)@±15V mV
• Maximum Load Resistance: 2000 Ohm
• Output Type: 1-Channel Mono
• Voltage - Supply: 10 V ~ 36 V, ±5 V ~ 18 V
• Features: Differential Inputs
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Amplifier Class: AB
• No. Of Channels: 1
• Supply Voltage Range: ± 5V To ± 18V
• Load Impedance: 2kohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SSM2019
GAIN
The SSM2019 only requires a single external resistor to set the
voltage gain. The voltage gain, G, is:
and the external gain resistor, R
For convenience, Table I lists various values of R
gain levels.
The voltage gain can range from 1 to 3500. A gain set resistor is
not required for unity gain applications. Metal film or wire-wound
resistors are recommended for best results.
The total gain accuracy of the SSM2019 is determined by the
tolerance of the external gain set resistor, R
gain equation accuracy of the SSM2019. Total gain drift combines
the mismatch of the external gain set resistor drift with that of
the internal resistors (20 ppm/∞C typ).
Bandwidth of the SSM2019 is relatively independent of gain,
as shown in Figure 2. For a voltage gain of 1000, the SSM2019
has a small-signal bandwidth of 200 kHz. At unity gain, the
bandwidth of the SSM2019 exceeds 4 MHz.
Table I. Values of R
G =
Figure 1. Basic Circuit Connections
(+IN) – (– IN)
V
OUT
R
NC
4.7 k
1.1 k
330
100
32
10
+IN
–IN
G
( ) A
=
G
R
10k
R
G
R
=
G
G
10
G
1
3.2
10
31.3
100
314
1000
=
R
for Various Gain Levels
V
+ 1
G
10
k
G
G
, is:
R
SSM2019
R
W
G1
G2
k
–
V+
V–
W
+
1
dB
0
10
20
30
40
50
60
1
REFERENCE
G
, combined with the
G
for common
OUT
–6–
NOISE PERFORMANCE
The SSM2019 is a very low noise audio preamplifier exhibiting
a typical voltage noise density of only 1 nV/÷
exceptionally low noise characteristics of the SSM2019 are in
part achieved by operating the input transistors at high collector
currents since the voltage noise is inversely proportional to the
square root of the collector current. Current noise, however, is
directly proportional to the square root of the collector current.
As a result, the outstanding voltage noise performance of the
SSM2019 is obtained at the expense of current noise performance.
At low preamplifier gains, the effect of the SSM2019 voltage
and current noise is insignificant.
The total noise of an audio preamplifier channel can be calculated by:
where:
E
e
i
R
e
For a microphone preamplifier, using a typical microphone
impedance of 150 W, the total input referred noise is:
where:
e
i
R
e
This total noise is extremely low and makes the SSM2019
virtually transparent to the user.
1 93
n
E
n
n
t
n
t
n
.
S
S
= source resistance thermal noise
= 1.6 nV/÷Hz @ 1 kHz, microphone thermal noise
= amplifier current noise
n
= 2 pA/÷Hz @ 1 kHz, SSM2019 i
= amplifier voltage noise
= 1 nV/÷Hz @ 1 kHz, SSM2019 e
= total input referred noise
= source resistance
= 150 W, microphone source impedance
=
nV
Figure 2. Bandwidth for Various Values of Gain
(
1
60
40
20
/
0
nV Hz
1k
Hz
V
T
S
A
@
=
= 25 C
15V
1
)
2
kHz
E
+
10k
n
2
(
=
pA
e
n
/
2
Hz
+
(
100k
i R
n
¥
150
n
S
n
)
2
+
W
e
)
t
2
2
1M
Hz
+
( .
1 6
at 1 kHz. The
nV
/
10M
Hz
REV. 0
)
2
=