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ISO124U

Isolation Amplifier, 1500Vrms, 0.01% NL, 50kHz, DIP-24

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Pieza del fabricante：

ISO124U

Paquete：

DIP-24 (0.600 inch / 15.24mm width)

Marca：

Categorías de productos：

Circuitos integrados lineales analógicos, Circuitos integrados IC

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Descripción

Productos

The ISO124U from Texas Instruments is a precision isolation amplifier with 1500Vrms continuous isolation, 0.01% nonlinearity, and 50kHz bandwidth in a DIP-24 package.

Especificaciones

Tipo	Precision Isolation Amplifier
Tensión de aislamiento	1500 Vrms (continuous)
Gain	1 V/V (fixed)
Gain Accuracy	+/-0.5% (max)
Nonlinearity	+/-0.01% (max)
Bandwidth	50 kHz
Isolation Rejection	140 dB @ 60 Hz
Tensión de alimentación	+/-4.5V to +/-18V (each side)
Isolation Capacitance	2.2 pF (typical)
Paquete	DIP-24 (0.600 inch width)
Temperatura de funcionamiento	-25C to +85C

Características

1500Vrms continuous isolation rating
Fixed unity gain with 0.5% accuracy
0.01% maximum nonlinearity
50kHz signal bandwidth
140dB isolation rejection at 60Hz
Dual independent supply rails (+/-4.5V to +/-18V)
2.2pF isolation capacitance

Aplicaciones

Medical ECG/EEG isolation
Industrial process control isolation
Motor current sensing isolation

Introducción del producto:ISO124U Presentación del producto

The ISO124U from Texas Instruments (originally Burr-Brown) is a precision isolation amplifier that provides galvanic isolation between input and output with 1500Vrms continuous rating. The device achieves 0.01% maximum nonlinearity through a duty-cycle modulation-demodulation scheme, where the input voltage is converted to a pulse-width modulated signal, transmitted across the isolation barrier via an internal transformer, and demodulated on the output side. The fixed unity gain (1 V/V) with 0.5% accuracy simplifies the signal path without external gain-setting components. The 50 kHz bandwidth supports most industrial and medical sensing applications. The 140 dB isolation rejection at 60 Hz eliminates power-line interference in sensitive measurements. The DIP-24 package provides wide creepage and clearance distances for high-voltage isolation. The dual independent supply rails allow the input and output sides to be powered from different sources.

Principio de funcionamiento:ISO124U Principio de funcionamiento

The ISO124U uses a duty-cycle modulation technique to transmit analog signals across the isolation barrier. On the input side, the input voltage is compared against a 500 kHz triangular wave in a PWM modulator, producing a pulse-width modulated digital signal whose duty cycle is proportional to the input voltage. This digital signal is transmitted through an internal planar transformer that provides the galvanic isolation barrier. On the output side, a demodulator reconstructs the analog signal by filtering the PWM signal with a 2nd-order low-pass filter. The 50 kHz bandwidth is determined by the output filter cutoff frequency. The 0.01% nonlinearity is achieved because the PWM modulation is inherently linear – the duty cycle is directly proportional to the input voltage with high precision. The isolation characteristics are determined by the transformer: 1500Vrms continuous rating, 2.2pF coupling capacitance, and 140dB isolation rejection at 60 Hz. The transformer’s high magnetizing inductance and low inter-winding capacitance ensure signal integrity while maintaining safety isolation.

Descripción de la clavija:ISO124U Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	VIN+	Entrada	Non-inverting signal input
2	VIN-	Entrada	Inverting signal input
3	V+IN	Potencia	Input side positive supply
4	V-IN	Potencia	Input side negative supply
5	COM IN	Potencia	Input side common (ground)
6,7	NC	-	Sin conexión
8	OSC	Salida	Internal oscillator output (decouple)
9	COM OUT	Potencia	Output side common (ground)
10	V-OUT	Potencia	Output side negative supply
11	V+OUT	Potencia	Output side positive supply
12	VOUT	Salida	Isolated output voltage

Application Scenarios:In which products and applications isISO124U usado

Medical ECG front-end with 1500Vrms patient isolation and 0.01% linearity
Industrial 4-20mA current loop receiver with 140dB 60Hz rejection
Motor phase current sensing with high-side shunt and isolated output
Data acquisition system channel-to-channel isolation with 50kHz bandwidth

Alternative Models:What chips are recommended as replacements for ISO124U

Fabricante	Número de pieza	Paquete	Notas
TI	ISO124P	DIP-24	Wider temperature range version
TI	AMC1301DWVR	SOIC-8	Isolated current-sense amplifier, newer
ADI	AD202JN	DIP-24	Isolation amplifier, alternative
TI	ISO224	SOIC-16	Isolated amplifier, newer, smaller
Laboratorios Silicon	Si8920B-IS	SOIC-8	Isolated current sense, digital output