Analog Devices SSM2164S, SSM2164P Datasheet

a		Low Cost Quad
		Voltage Controlled Amplifier
		SSM2164

FEATURES

Four High Performance VCAs in a Single Package 0.02% THD

No External Trimming 120 dB Gain Range

0.07 dB Gain Matching (Unity Gain) Class A or AB Operation

APPLICATIONS

Remote, Automatic, or Computer Volume Controls Automotive Volume/Balance/Faders

Audio Mixers Compressor/Limiters/Compandors Noise Reduction Systems Automatic Gain Controls

Voltage Controlled Filters

Spatial Sound Processors Effects Processors

GENERAL DESCRIPTION

The SSM2164 contains four independent voltage controlled amplifiers (VCAs) in a single package. High performance

(100 dB dynamic range, 0.02% THD) is provided at a very low cost-per-VCA, resulting in excellent value for cost sensitive gain control applications. Each VCA offers current input and output for maximum design flexibility, and a ground referenced

–33 mV/dB control port.

All channels are closely matched to within 0.07 dB at unity gain, and 0.24 dB at 40 dB of attenuation. A 120 dB gain range is possible.

A single resistor tailors operation between full Class A and AB modes. The pinout allows upgrading of SSM2024 designs with minimal additional circuitry.

The SSM2164 will operate over a wide supply voltage range of

±4 V to ±18 V. Available in 16-pin P-DIP and SOIC packages, the device is guaranteed for operation over the extended industrial temperature range of –40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

VC
IIN		VCA1	IIOUT
VC
IIN		VCA2	IIOUT
VC
IIN		VCA3	IIOUT
VC
IIN		VCA4	IIOUT
	POWER SUPPLY
AND BIASING CIRCUITRY
V+	GND	V–	MODE

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SSM2164–SPECIFICATIONS

ELECTRICAL SPECIFICATIONS(VS = ±15 V, AV = 0 dB, 0 dBu = 0.775 V rms, VIN = 0 dBu, RIN = ROUT = 30 kΩ, f = 1 kHz, –40°C < TA < +85°C using Typical Application Circuit (Class AB), unless otherwise noted. Typical specifications apply at TA = +25°C.)

			SSM2164
Parameter	Conditions	Min	Typ	Max	Units
AUDIO SIGNAL PATH
Noise	VIN = GND, 20 kHz Bandwidth		–94		dBu
Headroom	Clip Point = 1% THD+N		22		dBu
Total Harmonic Distortion	2nd and 3rd Harmonics Only
	AV = 0 dB, Class A		0.02	.1	%
	AV = ±20 dB, Class A1		0.15		%
	AV = 0 dB, Class AB		0.16		%
	AV = ±20 dB, Class AB1		0.3		%
Channel Separation			–110		dB
Unity Gain Bandwidth	CF = 10 pF		500		kHz
Slew Rate	CF = 10 pF		0.7		mA/μs
Input Bias Current			±10		nA
Output Offset Current	VIN = 0		±50		nA
Output Compliance			±0.1		V
CONTROL PORT					kΩ
Input Impedance			5
Gain Constant	(Note 2)		–33		mV/dB
Gain Constant Temperature Coefficient	0 dB to –40 dB Gain Range3		–3300		ppm/°C
Control Feedthrough			1.5	8.5	mV
Gain Matching, Channel-to-Channel	AV = 0 dB		0.07		dB
	AV = –40 dB		0.24		dB
Maximum Attenuation			–100		dB
Maximum Gain			+20		dB
POWER SUPPLIES		±4		±18
Supply Voltage Range					V
Supply Current	Class AB		6	8	mA
Power Supply Rejection Ratio	60 Hz		90		dB

NOTES

1–10 dBu input @ 20 dB gain; +10 dBu input @ –20 dB gain. 2After 60 seconds operation.

3+25°C to +85°C.

Specifications subject to change without notice.

TYPICAL APPLICATION AND TEST CIRCUIT

VC	14						100pF
VC4
IIN	15		VCA4		13	IIOUT	30kΩ
							1/2
30kΩ								VOUT4
V							OP275
IN4
500Ω
560pF		POWER SUPPLY
	AND BIASING CIRCUITRY
	9	8	16		1
		V–	GND	V+	MODE
		0.1µF	0.1µF		RB (7.5kΩ CLASS A)
						(OPEN CLASS AB)
	–15V		+15V

Figure 1. RIN = ROUT = 30 kΩ, CF = 100 pF. Optional RB = 7.5 kΩ, Biases Gain Core to Class A Operation. For Class AB, Omit RB.

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SSM2164

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V Input, Output, Control Voltages . . . . . . . . . . . . . . . . V– to V+ Output Short Circuit Duration to GND . . . . . . . . . Indefinite Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C Operating Temperature Range . . . . . . . . . . . . . –40°C to +85°C Junction Temperature Range . . . . . . . . . . . . –65°C to +150°C Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C

Package Type	θJA*	θJC	Units
16-Pin Plastic DIP (P Suffix)	76	33	°C/W
16-Pin SOIC (S Suffix)	92	27	°C/W

*θJA is specified for the worst case conditions; i.e., θJA is specified for device in socket for P-DIP packages, θJA is specified for device soldered in circuit board for SOIC package.

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Options
SSM2164P	–40°C to +85°C	Plastic DIP	N-16
SSM2164S	–40°C to +85°C	Narrow SOIC	R-16A

PIN CONFIGURATION

16-Lead Epoxy DIP and SOIC

MODE	1				16	V+
IIN1	2				15	IIN4
VC1	3				14	VC4
IOUT1		SSM2164				IOUT4
	4				13
		TOP VIEW
IOUT2	5	(Not to Scale)			12	IOUT3
VC2	6				11	VC3
IIN2						IIN3
	7				10
GND	8				9	V–

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the SSM2164 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

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SSM2164

Typical Performance Characteristics

	1.0
		CLASS A
		VS = ±15V
		LPF = 80kHz
+ N – %			AV = + 20dB
	0.1
THD			AV	= – 20dB
			AV = 0dB
	0.01
	20	100	1k	10k	20k
			FREQUENCY – Hz

Figure 2. THD+N vs. Frequency, Class A

	1.0
				CLASS AB
				VS = ±15V
				LPF = 80kHz
		AV = +20dB	AV = –20dB
N – %	0.1		AV = 0dB
THD +
	0.01
	20	100	1k	10k	20k

FREQUENCY – Hz

Figure 3. THD+N vs. Frequency Class, AB

300
280																		VS = ±15V
260
																		TA = +25°C
240																		1200 CHANNELS
220
200
180
160
UNITS
140
120
100
80
60
40
20
0
0.005			0.010			0.015		0.020				0.025			0.030			0.035				0.040				0.045			0.050
												THD – %

Figure 4. THD Distribution, Class A

210
200																				VS = ±15V
190
180																				TA = +25°C
170																				1200 CHANNELS
160
150
140
130
120
UNITS
110
100
90
80
70
60
50
40
30
20
10
0
0.00				0.05			0.10			0.15				0.20			0.25			0.30				0.35		0.40				0.45
														THD – %

Figure 5. THD Distribution, Class AB

	1.0
		VS ±15V
		AV = 0dB
		LPF = 22kHz
N – %	0.1	CLASS AB
+
THD
		CLASS A
	0.01
	20	100	1k	10k	20k
		AMPLITUDE – VRMS

Figure 6. THD+N vs. Amplitude

0.10

LPF = 80kHz

0.08

%	0.06
THD + N –	0.04

0.02

0

0

±4

±8

±12

±16

±20

SUPPLY – Volts

Figure 7. THD+N vs. Supply Voltage, Class A

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