870

NTE870
Integrated Circuit
Dual Operational Transconductance Amp
Description:
The NTE870 consists of two current controlled transconductance amplifiers each with differential inputs and a push–pull output. The two amplifiers share common supplies but otherwise operate independently. Linearizing diodes are provided at the inputs to reduce distortion and allow higher input
levels resulting in a 10dB signal–to–noise improvement referenced to 0.5 percent THD. Controlled
impedance buffers are provided which are especially designed to complement the dynamic range of
the amplifiers.
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, V+/V– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V or ±18V
Differential Input Voltage, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5V
Diode Bias Current, ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Amp Bias Current, IABC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Buffer Output Current, Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570mW
DC Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V–
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Electrical Characteristics: (TA = +25°C, V+/V– = ±15V, IABC = 500µA unless otherwise specified)
Parameter
Input Offset Voltage (VOS)
Symbol
Test Conditions
VIO
Min
Typ
Max
Unit
–
0.4
5.0
mV
Input Offset Voltage
IABC = 5µA
–
0.3
5.0
mV
VOS Including Diodes
Diode Base Current, ID = 500µA
–
0.5
5.0
mV
Input Offset Change
5µA ≤ IABC ≤ 500µA
–
0.1
–
mV
–
0.4
5.0
µA
–
1.0
8.0
µA
Input Bias Current
IB
TA = –20° to +75°C
Electrical Characteristics (Cont’d): (TA = +25°C, V+/V– = ±15V, IABC = 500µA)
Parameter
Symbol
Forward Transconductance (gm)
gm
Min
Typ
6700
9600
TA = –20° to +75°C
5400
–
–
µmhos
RL = 0, IABC = 5µA
–
0.3
–
dB
RL = 0, IABC = 5µA
–
5.0
–
µA
RL = 0, IABC = 500µA
350
500
650
µA
RL = 0, TA = –20° to +75°C
300
–
–
µA
RL = ∞, 5µA ≤ IABC ≤ 500µA
+12
±14.2
–
V
RL = ∞, 5µA ≤ IABC ≤ 500µA
–12
–14.4
–
V
–
2.6
–
mA
∆VOS/∆V+
76.5
94.0
–
dB
∆VOS/∆V–
76.5
94.0
–
dB
IIO
–
0.1
0.6
µA
CMMR
CMR
80
110
–
dB
Common Mode Range
VICM
±12.0
±13.5
–
V
gm Tracking
Peak Output Current
Peak Output Voltage Positive
IOP
VOP
Peak Output Voltage Negative
Supply Current
VOS Sensitivity Positive
ICC
SVR
VOS Sensitivity Negative
Input Offset Current
Test Conditions
IABC = 500µA, two circuit
Max
Unit
13000 µmhos
Cross Talk
CT
20Hz < f < 20kHz, Note 2
–
–100
100
dB
Differential Input Current
IID
IABC = 0, Input = ±4V
–
0.02
100
nA
IABC = 0
–
0.2
0
nA
10
26
–
kΩ
–
2
–
MHz
–
50
–
V/µs
Leakage Current
ILEAK
Input Resistance
RIN
Open Loop Bandwidth
Slew Rate
SR
Buffer Input Current
Note 2
–
0.4
5.0
µA
Peak Buffer Output Voltage
Note 2
10
–
–
V
Note 1. Open unless otherwise specified. The inputs to the buffers are grounded and the outputs
are open.
Note 2. ROUT = 5kΩ connected from the buffer output to V– and the input buffer is connected to
the transconductance amplifier output. IABC = 500µA.
Pin Connection Diagram
Amp Bias Input A 1
16 Amp Bias Input B
15 Diode Bias B
Diode Bias A 2
Non–Inverting Input A 3
14 Non–Inverting Input B
Inverting Input A 4
13 Inverting Input B
Output A 5
12 Output B
V– 6
11 V+
Buffer Input A 7
10 Buffer Input B
Buffer Output A 8
16
9 Buffer Output B
9
.260 (6.6) Max
1
8
.785 (19.9) Max
.300 (7.62)
.200 (5.08)
Max
.245
(6.22)
Min
.100 (2.54)
.700 (17.7)
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