LM13700
Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers

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The LM13700 series 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. The result is a 10 dB signal-to-noise improvement referenced to 0.5 percent THD. High impedance  buffers are provided which are especially designed to complement the dynamic range of the amplifiers. The output buffers of the LM13700 differ from those of the LM13600 in that their input bias currents (and hence their output DC levels) are independent of IABC. This may result in performance superior to that of the LM13600 in audio applications.

·Current-controlled amplifiers
·Current-controlled impedances
·Current-controlled filters
·Current-controlled oscillators
·Multiplexers
·Timers
·Sample-and-hold circuits
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (Note 2)
LM13700 .............................................36 VDC or ±18V
LM13700A ...........................................44 VDC or ±22V
Power Dissipation (Note 3) TA = 25°C
LM13700N, LM13700AN ...................................570 mW
Differential Input Voltage...................................... ±5V
Diode Bias Current (ID)......................................... 2mA
Amplifier Bias Current (IABC) .................................2mA
Output Short Circuit Duration Continuous
Buffer Output Current (Note 4) ...........................20 mA
Operating Temperature Range
LM13700N, LM13700AN ........................0°C to +70°C
DC Input Voltage ..........................................+VS to −VS
Storage Temperature Range ...........−65°C to +150°C
Soldering Information
Dual-In-Line Package
Soldering (10 sec.) .............................................260°C
Small Outline Package
Vapor Phase (60 sec.)........................................ 215°C
Infrared (15 sec.) ................................................220°C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
·gm adjustable over 6 decades
·Excellent gm linearity
·Excellent matching between amplifiers
·Linearizing diodes
·High impedance buffers
·High output signal-to-noise ratio

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LM1008J/883 LM100A Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
LM100AH 1270 nm ~ 1610 nm DFB LD MODULES 2.5 Gbps CWDM MQW-DFB LD RECEPTACLE LM100AH/883 8 Megabit (1024K x 8-bit) Flash Memory
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LM100CH Versa 8051 3.3V MCU with 64KB of IAP/ISP Flash LM100CIWM 1500 WATT BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSOR
LM100CN 1 WATT METAL CASE ZENER DIODES LM100F CIT SWITCH
LM100H 18-Mbit DDR-II+ SRAM 2-Word Burst Architecture (2.5 Cycle Read Latency) LM100H/883 Quad Single Supply Comparator

Datasheet

Size: 633.4KB
Page: 24
PDF: LM13700.pdf
  • Description:
    Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers
  • MFG:
    NSC [National Semiconductor]
 

Abstract


LM13700/LM13700A
Dual Operational Transconductance Amplifiers with
Linearizing Diodes and Buffers
General Description
The LM13700 series 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 di-
odes are provided at the inputs to reduce distortion and allow
higher input levels. The result is a 10 dB signal-to-noise im-
provement referenced to 0.5 percent THD. High impedance
buffers are provided which are especially designed to
complement the dynamic range of the amplifiers. The output
buffers of the LM13700 differ from those of the LM13600 in
that their input bias currents (and hence their output DC lev-
els) are independent of I
ABC
. This may result in performance
superior to that of the LM13600 in audio applications.
Features
n g
m
adjustable over 6 decades
n Excellent g
m
linearity
n Excellent matching between amplifiers
n Linearizing diodes
n High impedance buffers
n High output signal-to-noise ratio
Applications
n Current-controlled amplifiers
n Current-controlled impedances
n Current-controlled filters
n Current-controlled oscillators
n Multiplexers
n Timers
n Sample-and-hold circuits
Connection Diagram
Dual-In-Line and Small Outline Packages
DS007981-2
Top View
Order Number LM13700M, LM13700N or LM13700AN
See NS Package Number M16A or N16A
May 1998
LM13700/LM13700A
Dual
Operational
T
ransconductance
Amplifiers
with
Linearizing
Diodes
and
Buffers
? 1999 National Semiconductor Corporation DS007981 www.national.com

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