Datasheet LT1218, LT1219 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Precision Rail-to-Rail Input and Output Op Amps |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTION. Rail-to-Rail Input and Output. V VOS(MAX) for VCM … |
| Formato / tamaño de archivo | PDF / 329 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Rail-to-Rail Input and Output. V VOS(MAX) for VCM = V– to V+. High Common Mode Rejection Ratio: 97dB Min
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LT1218/LT1219 Precision Rail-to-Rail Input and Output Op Amps
U FEATURES DESCRIPTION
■
Rail-to-Rail Input and Output
The LT®1218/LT1219 are bipolar op amps which combine ■
90
µ
V VOS(MAX) for VCM = V– to V+
rail-to-rail input and output operation with precision speci- ■
High Common Mode Rejection Ratio: 97dB Min
fications. Unlike other rail-to-rail amplifiers, the LT1218/ ■
C-LoadTM Stable Version (LT1219)
LT1219’s input offset voltage is a low 90µV across the ■ High A entire rail-to-rail input range, not just a portion of it. Using VOL: 500V/mV Minimum Driving 10kΩ Load ■ Wide Supply Range: a patented technique, both input stages of the LT1218/ 2V to ±15V (LT1218/LT1219) LT1219 are trimmed: one at the negative supply and the 2V to ±5V (LT1218L/LT1219L) other at the positive supply. The resulting common mode ■ Shutdown Mode: I rejection of 97dB minimum is much better than other rail- S < 30µA to-rail input op amps. A minimum open-loop gain of ■ Low Supply Current: 420µA Max 500V/mV into a 10k load virtually eliminates all gain error. ■ Low Input Bias Current: 18nA Typical ■ 300kHz Gain-Bandwidth Product (LT1218) The LT1218 has conventional compensation which ■ Slew Rate: 0.10V/µs (LT1218) assures stability for capacitive loads of 1000pF or less. The LT1219 has compensation that requires the use of a
U
0.1µF output capacitor, which improves the amplifier’s
APPLICATIONS
supply rejection and reduces output impedance at high ■ frequencies. The output capacitor’s filtering action also Driving A/D Converters ■ reduces high frequency noise, which is beneficial when Test Equipment Amplifiers ■ driving A/D converters. MUX Amplifiers High and low voltage versions of the devices are offered. Operation is specified for 3V, 5V and ±5V supplies for the LT1218L/LT1219L and 3V, 5V and ±15V for the LT1218/ , LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation. LT1219.
U TYPICAL APPLICATION MUX Amplifier Voltage Follower Input to Output Error
5V 10 VS = 5V AV = 1 VIN1 + NO LOAD LT1218L VOUT 1.0 – SHDN (mV) MAX ERROR = 110µV 5V ERROR 0.1 0.05V ≤ VIN ≤ 4.8V VIN2 + LT1218L – MAXIMUM IN SHDN TO OUT ERROR 0.01 = 110µV FOR 0 1 2 3 4 5 0.05V ≤ V 0.05 4.95 IN ≤ 4.8V INPUT VOLTAGE (V) INPUT RL = 10k LT1218/19 • TA02 SELECT 74HCO4 1218/19 • TA01 1
U FEATURES DESCRIPTION
■
Rail-to-Rail Input and Output
The LT®1218/LT1219 are bipolar op amps which combine ■
90
µ
V VOS(MAX) for VCM = V– to V+
rail-to-rail input and output operation with precision speci- ■
High Common Mode Rejection Ratio: 97dB Min
fications. Unlike other rail-to-rail amplifiers, the LT1218/ ■
C-LoadTM Stable Version (LT1219)
LT1219’s input offset voltage is a low 90µV across the ■ High A entire rail-to-rail input range, not just a portion of it. Using VOL: 500V/mV Minimum Driving 10kΩ Load ■ Wide Supply Range: a patented technique, both input stages of the LT1218/ 2V to ±15V (LT1218/LT1219) LT1219 are trimmed: one at the negative supply and the 2V to ±5V (LT1218L/LT1219L) other at the positive supply. The resulting common mode ■ Shutdown Mode: I rejection of 97dB minimum is much better than other rail- S < 30µA to-rail input op amps. A minimum open-loop gain of ■ Low Supply Current: 420µA Max 500V/mV into a 10k load virtually eliminates all gain error. ■ Low Input Bias Current: 18nA Typical ■ 300kHz Gain-Bandwidth Product (LT1218) The LT1218 has conventional compensation which ■ Slew Rate: 0.10V/µs (LT1218) assures stability for capacitive loads of 1000pF or less. The LT1219 has compensation that requires the use of a
U
0.1µF output capacitor, which improves the amplifier’s
APPLICATIONS
supply rejection and reduces output impedance at high ■ frequencies. The output capacitor’s filtering action also Driving A/D Converters ■ reduces high frequency noise, which is beneficial when Test Equipment Amplifiers ■ driving A/D converters. MUX Amplifiers High and low voltage versions of the devices are offered. Operation is specified for 3V, 5V and ±5V supplies for the LT1218L/LT1219L and 3V, 5V and ±15V for the LT1218/ , LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation. LT1219.
U TYPICAL APPLICATION MUX Amplifier Voltage Follower Input to Output Error
5V 10 VS = 5V AV = 1 VIN1 + NO LOAD LT1218L VOUT 1.0 – SHDN (mV) MAX ERROR = 110µV 5V ERROR 0.1 0.05V ≤ VIN ≤ 4.8V VIN2 + LT1218L – MAXIMUM IN SHDN TO OUT ERROR 0.01 = 110µV FOR 0 1 2 3 4 5 0.05V ≤ V 0.05 4.95 IN ≤ 4.8V INPUT VOLTAGE (V) INPUT RL = 10k LT1218/19 • TA02 SELECT 74HCO4 1218/19 • TA01 1