NTE NTE870 Datasheet

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, V
Diode Bias Current, I
Amp Bias Current, I

D

ABC

Buffer Output Current, I
Power Dissipation, P
DC Input Voltage, V

D

IN

Operating Temperature Range, T
Storage Temperature Range, T

Electrical Characteristics:

Parameter Symbol Test Conditions Min Typ Max Unit

Input Offset Voltage (VOS) V
Input Offset Voltage I
VOS Including Diodes Diode Base Current, ID = 500µA – 0.5 5.0 mV

ID

o

opr

stg

(TA = +25°C, V+/V– = ±15V, I

IO

= 5µA – 0.3 5.0 mV

ABC

–20° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

= 500µA unless otherwise specified)

ABC

– 0.4 5.0 mV

570mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V+ to V–. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Offset Change 5µA ≤ I
Input Bias Current I

B

TA = –20° to +75°C – 1.0 8.0 µA

≤ 500µA – 0.1 – mV

ABC

– 0.4 5.0 µA

Electrical Characteristics (Cont’d): (TA = +25°C, V+/V– = ±15V, I

= 500µA)

ABC

Parameter Symbol Test Conditions Min Typ Max Unit

Forward Transconductance (gm) gm 6700 9600 13000 µmhos

TA = –20° to +75°C 5400 – – µmhos
gm Tracking RL = 0, I
Peak Output Current I

OP

RL = 0, I

RL = 0, I

= 5µA – 0.3 – dB

ABC

= 5µA – 5.0 – µA

ABC

= 500µA 350 500 650 µA

ABC

RL = 0, TA = –20° to +75°C 300 – – µA
Peak Output Voltage Positive V

OP

Peak Output Voltage Negative RL = ∞, 5µA ≤ I
Supply Current I

CC

RL = ∞, 5µA ≤ I

I

= 500µA, two circuit – 2.6 – mA

ABC

≤ 500µA +12 ±14.2 – V

ABC

≤ 500µA –12 –14.4 – V

ABC

VOS Sensitivity Positive SVR ∆VOS/∆V+ 76.5 94.0 – dB
VOS Sensitivity Negative ∆VOS/∆V– 76.5 94.0 – dB
Input Offset Current I

IO

– 0.1 0.6 µA
CMMR CMR 80 110 – dB
Common Mode Range V

ICM

±12.0 ±13.5 – V
Cross Talk CT 20Hz < f < 20kHz, Note 2 – –100 100 dB
Differential Input Current I
Leakage Current I

LEAKIABC

Input Resistance R

ID

I

= 0, Input = ±4V – 0.02 100 nA

ABC

= 0 – 0.2 0 nA

IN

10 26 – kΩ
Open Loop Bandwidth – 2 – MHz
Slew Rate SR – 50 – V/µs
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. R

= 5kΩ connected from the buffer output to V– and the input buffer is connected to

OUT

the transconductance amplifier output. I

= 500µA.

ABC