Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class AB PDIP 8

SSM2019

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REV. 0

Self-Contained

Audio Preamplifier

FUNCTIONAL BLOCK DIAGRAM

5k

1

5k

V–

5k

OUT

5k

1

REFERENCE

V–

+IN

V+

–IN

GENERAL DESCRIPTION

The SSM2019 is a latest generation audio preamplifier, combin-

ing SSM preamplifier design expertise with advanced processing.

The result is excellent audio performance from a monolithic

device, requiring only one external gain set resistor or potentiom-

eter. The SSM2019 is further enhanced by its unity gain stability.

Key specifications include ultra-low noise (1.5 dB noise figure) and

THD (<0.01% at G = 100), complemented by wide bandwidth

and high slew rate.

Applications for this low cost device include microphone pream-

plifiers and bus summing amplifiers in professional and consumer

audio equipment, sonar, and other applications requiring a low

noise instrumentation amplifier with high gain capability.

FEATURES

Excellent Noise Performance: 1.0 nV/

Hz or

1.5 dB Noise Figure

Ultra-low THD: < 0.01% @ G = 100 Over the

Full Audio Band

Wide Bandwidth: 1 MHz @ G = 100

High Slew Rate: 16 V/s @ G = 10

10 V rms Full-Scale Input,

G = 1, V

= 18 V

Unity Gain Stable

True Differential Inputs

Subaudio 1/f Noise Corner

8-Lead PDIP or 16-Lead SOIC

Only One External Component Required

Very Low Cost

Extended Temperature Range: –40C to +85C

APPLICATIONS

Audio Mix Consoles

Intercom/Paging Systems

2-Way Radio

Sonar

Digital Audio Systems

PIN CONNECTIONS

8-Lead PDIP (N Suffix)

8-Lead Narrow Body SOIC (RN Suffix)*

TOP VIEW

(Not to Scale)

–IN

+IN

V+

OUT

REFERENCEV–

SSM2019

16-Lead Wide Body SOIC (RW Suffix)

TOP VIEW

(Not to Scale)

NC = NO CONNECT

–IN

+IN

V–

V+

OUT

REFERENCE

SSM2019

*Consult factory for availability.

Summary of content (8 pages)

PAGE 1
a FEATURES Excellent Noise Performance: 1.0 nV/÷Hz or 1.5 dB Noise Figure Ultra-low THD: < 0.
PAGE 2
V and –40 C £ T £ +85 C, unless otherwise noted. Typical specifications SSM2019–SPECIFICATIONS (Vapply= 15 at T = 25 C.
PAGE 3
SSM2019 ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 19 V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . 10 sec Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C Junction Temperature (TJ) . . . . . . . . . . . . . –65∞C to +150∞C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300∞C Operating Temperature Range . . . .
PAGE 4
SSM2019 100 TA = 25 C VS = 15V GAIN 80 IMPEDANCE – 10 f = 1kHz OR 10kHz 1 70 60 50 40 30 20 10 GAIN = 1 25 20 TA = 25 C RL = 2k VS = 15V 15 10 10 100 0 100 1k GAIN G 12 G=1 8 6 4 2 1k 10k 100 LOAD RESISTANCE – 10 30 20 10 30 20 SUPPLY VOLTAGE (V+ – V–) – V 150 G = 1000 125 100 +PSRR – dB 75 G=1 25 20 1k 10k FREQUENCY– Hz TPC 9. CMRR vs. Frequency 100k 0 10 G = 100 G = 10 G = 100 G=1 75 50 50 40 40 150 100 G=1 100 0 40 TPC 8. Output Voltage Range vs.
PAGE 5
SSM2019 0.040 0 0.02 V+/V– = TA = 25 C –1 0.030 0 –2 0.025 –0.01 –3 0.020 0.015 VOOS – mV 0.01 VIOS – mV VIOS – mV V+/V– = 15V 0.035 –0.02 –0.03 –4 –5 0.010 –0.04 –6 0.005 –0.05 –7 0 –50 –25 0 25 50 TEMPERATURE – C 75 100 –0.06 0 5 10 15 20 25 30 35 SUPPLY VOLTAGE (VCC – VEE) – V –8 –50 40 TPC 13. VIOS vs. Supply Voltage TPC 12. VIOS vs.
PAGE 6
SSM2019 V+ VS = ⴞ15V TA = 25ⴗC +IN SSM2019 VOLTAGE GAIN – dB RG1 RG OUT RG2 REFERENCE –IN G= VOUT (+IN) – (– IN) = 10k⍀ RG +1 V– 60 40 20 0 Figure 1. Basic Circuit Connections GAIN 1k The SSM2019 only requires a single external resistor to set the voltage gain. The voltage gain, G, is: G= For convenience, Table I lists various values of RG for common gain levels. Table I. Values of RG for Various Gain Levels NC 4.7 k 1.1 k 330 100 32 10 0 10 20 30 40 50 60 1 3.2 10 31.
PAGE 7
SSM2019 Although the SSM2019 inputs are fully floating, care must be exercised to ensure that both inputs have a dc bias connection capable of maintaining them within the input common-mode range. The usual method of achieving this is to ground one side of the transducer as in Figure 3a. An alternative way is to float the transducer and use two resistors to set the bias point as in Figure 3b.
PAGE 8
SSM2019 critical, then the servo loop can be replaced by the diode biasing scheme of Figure 5. If ac coupling is used throughout, then Pins 2 and 3 may be directly grounded. BUS SUMMING AMPLIFIER In addition to its use as a microphone preamplifier, the SSM2019 can be used as a very low noise summing amplifier. Such a circuit is particularly useful when many medium impedance outputs are summed together to produce a high effective noise gain.