a
FEATURES High Common-Mode Rejection DC: 90 dB typ 60 Hz: 90 dB typ 20 kHz: 85 dB typ Ultralow THD: 0.0006% typ @ 1 kHz Fast Slew Rate: 10 V/ s typ Wide Bandwidth: 7 MHz typ (G = 1/2) Two Gain Levels Available: G = 1/2 or 2 Low Cost
12k Ω –IN
–6 dB Differential Line Receiver SSM2143
FUNCTIONAL BLOCK DIAGRAM
6k Ω SENSE V+ VOUT V– 12k Ω +IN 6kΩ REFERENCE
SSM2143
PIN CONNECTIONS Epoxy Mini-DIP (P Suffix) and SOIC (S Suffix)
REF –IN +IN V– 1 2 3 4 8 NC
GENERAL DESCRIPTION
The SSM2143 is an integrated differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of immunity from common-mode noise. The device provides a typical 90 dB of common-mode rejection (CMR), which is achieved by laser trimming of resistances to better than 0.005%. Additional features of the device include a slew rate of 10 V/µs and wide bandwidth. Total harmonic distortion (THD) is less than 0.004% over the full audio band, even while driving low impedance loads. The SSM2143 input stage is designed to handle input signals as large as +28 dBu at G = 1/2. Although primarily intended for G = 1/2 applications, a gain of 2 can be realized by reversing the +IN/–IN and SENSE/REFERENCE connections. When configured for a gain of 1/2, the SSM2143 and SSM2142 Balanced Line Driver provide a fully integrated, unity gain solution to driving audio signals over long cable runs. For similar performance with G = 1, see SSM2141.
SSM2143
TOP VIEW (NOT TO SCALE)
7 V+ 6 VOUT 5 SENSE
OP-482 NC = NO CONNECT
REV. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
15 V, –40 C ≤ ≤ = SSM2143–SPECIFICATIONS (V = specifications Tapply+85TC,=G+251/2, unless otherwise noted. Typical at C)
S A A
Parameter AUDIO PERFORMANCE Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio Headroom DYNAMIC RESPONSE Slew Rate Small Signal Bandwidth
Symbol THD+N SNR HR SR BW–3 dB
Conditions VIN = 10 V rms, RL = 10 kΩ, f = 1 kHz 0 dBu = 0.775 V rms, 20 kHz BW, RTI Clip Point = 1% THD+N RL = 2 kΩ, CL = 200 pF RL = 2 kΩ, CL = 200 pF G = 1/2 G=2 VCM = 0 V, RTI, G = 2 VCM = ± 10 V, RTO f = dc f = 60 Hz f = 20 kHz f = 400 kHz VS = ± 6 V to ± 18 V Common Mode Differential RL = 2 kΩ
Min
Typ 0.0006 –107.3 +28.0
Max
Units % dBu dBu V/µs MHz MHz
6
10 7 3.5
INPUT Input Offset Voltage Common-Mode Rejection
VIOS CMR
–1.2 70
0.05 90 90 85 60 110 ± 15 ± 28 ± 14 2 300 +45, –20 0.03 18 ± 10
+1.2
mV dB dB dB dB dB V V V kΩ pF mA
Power Supply Rejection Input Voltage Range OUTPUT Output Voltage Swing Minimum Resistive Load Drive Maximum Capacitive Load Drive Short Circuit Current Limit GAIN Gain Accuracy REFERENCE INPUT Input Resistance Voltage Range POWER SUPPLY Supply Voltage Range Supply Current
Specifications subject to change without notice.
PSR IVR
90
VO ISC
± 13
–0.1
0.1
% kΩ V
VS ISY
VCM = 0 V, RL = ∞
±6
± 2.7
± 18 ± 4.0
V mA
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . ± 22 V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ± 44 V Output Short Circuit Duration . . . . . . . . . . . . . . .Continuous Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . +150°C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . +300°C Thermal Resistance 8-Pin Plastic DIP (P): θJA = 103, θJC = 43 . . . . . . . . . °C/W 8-Pin SOIC (S): θJA = 150, θJC = 43. . . . . . . . . . . . . . °C/W
ABSOLUTE MAXIMUM RATINGS
ORDERING GUIDE
Model
Operating Temperature Range
Package Description
Package Option
SSM2143P –40°C to +85°C SSM2143S* –40°C to +85°C
*Contact sales office for availability.
8-Pin Plastic DIP N-8 8-Pin SOIC SO-8
–2–
REV. 0
SSM2143
1µs
100 9 0
100 90
1 0 0 %
10 0%
50mV
Figure 1. Small-Signal Transient Response (VIN = ±200 mV, G = 1/2, RL = 2 kΩ, VS = ± 15 V, TA = +25 °C)
5V
5µs
Figure 2. Large Signal Transient Response (VIN = +24 dBu, G = 1/2, RL = 2 kΩ VS = ± 15 V, TA = +25 °C)
Figure 3. THD+N vs. Frequency (VS = ± 15 V, VIN = 10 V rms, with 80 kHz Filter)
Figure 4. Headroom (VS = ± 15 V, RL = 10 kΩ, with 80 kHz Filter)
1.0
0.1
THD+N – %
0.01
0.001
0.0001 100
1k
10k
100k
LOAD RESISTANCE – Ω
Figure 5. Dynamic Intermodulation Distortion, DIM-100 (VS = ± 15 V, RL = 100 kΩ)
Figure 6. THD+N vs. Load (VS = ± 15 V, VIN = 10 V rms, with 1 kHz Sine, 80 kHz Filter)
REV. 0
–3–
SSM2143
40 VS = ±15V TA = +25°C 30
CLOSED-LOOP GAIN – dB
20
VS = ±15V TA = +25°C
10 0
–10 –20
–30 100
1k
10k
100k
1M
10M
FREQUENCY – Hz
Figure 7. Closed-Loop Gain vs. Frequency, 20 Hz to 20 kHz (Gain of 1/2 Normalized to 0 dB)
Figure 8. Closed-Loop Gain vs. Frequency, 100 Hz to 10 MHz
180 135 90 TA = +25°C VS = ±15V RL = 2kΩ
COMMON-MODE REJECTION – dB
120 VS = ±15V TA = +25°C
100
PHASE – Degrees
80
45 0 –45 –90
60
40
20
–135 –180 100
0 100
1k
10k 100k FREQUENCY – Hz
1M
10M
1k
10k FREQUENCY – Hz
100k
1M
Figure 9. Closed-Loop Phase vs. Frequency
Figure 10. Common-Mode Rejection vs. Frequency
140
10
POWER SUPPLY REJECTION – dB
120 100
VS = ±15V TA = +25°C
8
OUTPUT IMPEDANCE – Ω
VS = ±15V TA = +25°C
80 –PSRR 60 +PSRR 40 20
6
4
2
0 10
100
1k 10k FREQUENCY – Hz
100k
1M
0 100
1k
10k FREQUENCY – Hz
100k
1M
Figure 11. Power Supply Rejection vs. Frequency
Figure 12. Closed-Loop Output Impedance vs. Frequency
–4–
REV. 0
SSM2143
6 TA = +25°C VS = ±15V G = 1/2 RL = 2kΩ
12.5V TA = +25°C VS = ±15V 10.0V
OUTPUT VOLTAGE SWING – V rms
5
4
OUTPUT VOLTAGE SWING – V rms
10M
7.5V
3
5.0V
2
1
2.5V
0 1k 10k 100k FREQUENCY – Hz 1M
0V 10
100
1k
10k
LOAD RESISTANCE – Ω
Figure 13. Output Voltage Swing vs. Frequency
Figure 14. Output Voltage Swing vs. Load Resistance
40 TA = +25°C
120
OUTPUT VOLTAGE SWING – V p–p
VOLTAGE NOISE DENSITY – nV/ Hz
100
VS = ±15V TA = +25°C
30
80
20
60
40
10
20
0 0
±5
±10 SUPPLY VOLTAGE
±15
±20
0 1 10 100 FREQUENCY – Hz 1k 10k
Figure 15. Output Voltage Swing vs. Supply Voltage
Figure 16. Voltage Noise Density vs. Frequency
1s
100 90
100 9 0
10ms
0.5µV 0V –0.5µV
10 0 %
1 0 0 %
5µV 0V –5µV
5mV
Figure 17. Low Frequency Voltage Noise from 0.1 Hz to 10 Hz*
5mV
Figure 18. Voltage Noise from 0 kHz to 1 kHz*
*The photographs in Figure 17 through Figure 19 were taken at V S = ± 15 V and T A = +25°C, using an external amplifier with a gain of 1000.
REV. 0
–5–
SSM2143
16 VS = ±15V R L = 2kΩ 14
1ms
100 9 0
SLEW RATE – V/µs
12
5µV 0V –5µV
1 0 0 %
10
8
6
5mV
4 –50
–25
0 50 25 TEMPERATURE – °C
75
100
Figure 19. Voltage Noise from 0 kHz to 10 kHz*
Figure 20. Slew Rate vs. Temperature
0.10 VS = ±15V VIN = ±10V R S = 0Ω
400 VS = ±15V
INPUT OFFSET VOLTAGE – µV
0.08
300
GAIN ERROR – %
0.06
200
0.04
100
0.02
0 –50
–25
25 50 0 TEMPERATURE – °C
75
100
0 –50
–25
0
25
50
75
100
TEMPERATURE – °C
Figure 21. Gain Error vs. Temperature
Figure 22. Input Offset Voltage vs. Temperature
5 VS = ±15V 4 SUPPLY CURRENT – mA
SUPPLY CURRENT– mA
4.0 TA = +25°C 3.5
3.0
3
2.5
2
2.0
1
1.5
0 –50
–25
0
50 25 TEMPERATURE – °C
1.0
75
100
0
±5
±10 ±15 SUPPLY VOLTAGE – V
±20
Figure 23. Supply Current vs. Temperature
Figure 24. Supply Current vs. Supply Voltage
*The photographs in Figure 17 through Figure 19 were taken at V S = ± 15 V and T A = +25°C, using an external amplifier with a gain of 1000.
–6–
REV. 0
SSM2143
APPLICATIONS INFORMATION
The SSM2143 is designed as a balanced differential line receiver. It uses a high speed, low noise audio amplifier with four precision thin-film resistors to maintain excellent common-mode rejection and ultralow THD. Figure 25 shows the basic differential receiver application where the SSM2143 yields a gain of 1/2. The placement of the input and feedback resistors can be switched to achieve a gain of +2, as shown in Figure 26. For either circuit configuration, the SSM2143 can also be used unbalanced by grounding one of the inputs. In applications requiring a gain of +1, use the SSM2141.
+15V 0.1µF +15V 0.1µF
Setting ∆R to 5 Ω results in the CMRR of 71 dB, as stated above. To achieve the SSM2143’s CMRR of 90 dB, the resistor mismatch can be at most 0.57 Ω. In other words, to build this circuit discretely, the resistors would have to be matched to better than 0.005%! The following table shows typical resistor accuracies and the resulting CMRR for a differential amplifier. % Mismatch 5% 1% 0.1% 0.005%
DC OUTPUT LEVEL ADJUST
CMRR 30 dB 44 dB 64 dB 90 dB
12k –IN 2
7
6k 5
A V =1 2
7 6k –IN 5 SSM2143
12k 2 6 12k 3
AV = 2
SSM2143 12k +IN 3 4
+
6k
6 VOUT 1 +IN 1
6k 4
VOUT
The reference node of the SSM2143 is normally connected to ground. However, it can be used to null out any dc offsets in the system or to introduce a dc reference level other than ground. As shown in Figure 28, the reference node needs to be
+15V 0.1µF +10V OP27
0.1µF
0.1µF
–15V
–15V
12k –IN 2
7
6k 5 –10V
Figure 25. Standard Configuration for Gain of 1/2
CMRR
Figure 26. Reversing the Resistors Results in a Gain of 2
SSM2143
12k +IN 3 4 0.1µF 6k
6
VOUT REFERENCE
1
The internal thin-film resis
