IA294 MEDICAL ISOLATION AMPLIFIER Low Noise, with Active Input Reference and Shield Drives FEATURES • UL Component Recognized • True Instrumentation Front-End • Active Input Reference CHARACTERISTICS • Active Shield Drives (Typical, @ 25°C, Vs = +15 VDC unless otherwise noted.) • Low Noise: 8µV P-P, .05 to 100Hz • High CMRR: 126 dB Input to Output, • Isolated Power: ±15V @ 15mA GAIN (Non-inverting) ACCURACY Vs. Temperature Nonlinearity Differential Input Impedance Common Mode Input Impedance 10V / V ±2% ±. 01%/°C ±0.1% 3 X 108Ω || 3pF 3 X 1010Ω || 20pF • Small Size: 2” x 3” • External Sync Capability for Multi-Channel Monitors INPUT VOLTAGE Max. Safe Differential Input Pulse, 10ms Duration Max. Safe Common Mode Input (DC cont.) ±1V min. ±240V rms. ±6500V peak ±5000VDC INPUT BIAS CURRENT Vs. Temperature (0 to + 70°C) ±2nA ±0.02nA/°C SAFETY CURRENT LIMITS 10µA max. INPUT NOISE (5K UNBALANCE) Voltage .05Hz to 100Hz, pp Voltage 10Hz to 1kHz, rms. Current .05Hz to 1kHz, rms. 8µV 5µV 5pA 120 dB Input to Guard The Model IA294 Isolation Amplifier features small size, low noise, high common mode rejection, active guard and shield drives. CMRR is 126 dB input to output with balanced source impedance. CMRR from input to active input reference is 120 dB. This isolation amplifier contains most of the front-end circuitry that is found in COMMON MODE REJECTION Input to Output, CMV = 115 VAC, 60Hz Balanced Source Impedance 5KΩ Source Imbalance Two Inputs to Input Reference CMV = 10V p-p, 60Hz 5KΩ Source Imbalance monitor and diagnostic ECG’s. The IA294 has a true instrumentation front-end for high CMRR, active right leg drive, sync capability for multichannel use, isolated power (±15V @ 15mA) and separate 126 dB 120 dB 120 dB active drives for either individual shielded inputs or a common outer shield. This model also features 6500V input to output protection and 6500V differential input protection for defibrillators. Input to output leakage is less than 10µA. OUTPUT Range (50KΩ Load) Output Impedance Max. CMV, Outputs to Power Common Offset Voltage Referred to Input Vs. Temperature (0° to 70°C) Vs. Supply Voltage ±10V 1 KΩ ± 30 V peak ± 5mV ± 100µV / °C ± 20µV / % FREQUENCY RESPONSE Small Signal, - 3 dB Full Power, 6V pp Overload Recovery 1kHz 500Hz 20mS ISOLATED POWER OUTPUTS Voltage, ±10mA Load Accuracy Current, min. ±15VDC ±5% ± 15mA NOMINAL WEIGHT 8 Ounces POWER SUPPLY, SINGLRE POLARITY Voltage, Rated Performance Current, Quiescent ±14.5 to +16 VDC + 40 mA TEMPERATURE RANGE Rated Performance Storage 0°C to +70°C -25°C to +85°C MATING SOCKET S135 BLOCK DIAGRAM IA294 +SHIELD +IN + + Modulator - Demodulator - Filter HI OUT LO OUT CM SHIELD + - -IN -SHIELD Modulator Driver + Demodulator Driver + IN REF DC-DC Converter +Vs COMMON -Vs +Vs Oscillator COMMON SYNC .62 (15.75) MAX. 3023 (76.71) MAX. MODEL IA294 .20 (5.06) MIN. 7 + IN .04 (1.02) DIA. 2.02 (51.31) MAX. 8 9 HI OUT 10 LO OUT 11 SYNC 12 COM OUT +15 13 14 -S.D. +S.D. 6 - IN 5 4 S.D. COM REF IN 3 +Vs 2 1 Vs COM -Vs BOTTOM VIEW