Datasheet

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LT1218/LT1219

■

Rail-to-Rail Input and Output

■

V V

OS(MAX)

for V

= V

–

to V

■

High Common Mode Rejection Ratio: 97dB Min

■

C-Load

Stable Version (LT1219)

■

High A

VOL

: 500V/mV Minimum Driving 10kΩ Load

■

Wide Supply Range:

2V to ±15V (LT1218/LT1219)

2V to ±5V (LT1218L/LT1219L)

■

Shutdown Mode: I

< 30µA

■

Low Supply Current: 420µA Max

■

Low Input Bias Current: 18nA Typical

■

300kHz Gain-Bandwidth Product (LT1218)

■

Slew Rate: 0.10V/µs (LT1218)

FEATURES

DESCRIPTION

The LT

1218/LT1219 are bipolar op amps which combine

rail-to-rail input and output operation with precision speci-

fications. Unlike other rail-to-rail amplifiers, the LT1218/

LT1219’s input offset voltage is a low 90µV across the

entire rail-to-rail input range, not just a portion of it. Using

a patented technique, both input stages of the LT1218/

LT1219 are trimmed: one at the negative supply and the

other at the positive supply. The resulting common mode

rejection of 97dB minimum is much better than other rail-

to-rail input op amps. A minimum open-loop gain of

500V/mV into a 10k load virtually eliminates all gain error.

The LT1218 has conventional compensation which

assures stability for capacitive loads of 1000pF or less.

The LT1219 has compensation that requires the use of a

0.1µF output capacitor, which improves the amplifier’s

supply rejection and reduces output impedance at high

frequencies. The output capacitor’s filtering action also

reduces high frequency noise, which is beneficial when

driving A/D converters.

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/

LT1219.

APPLICATIONS

■

Driving A/D Converters

■

Test Equipment Amplifiers

■

MUX Amplifiers

Precision Rail-to-Rail Input

and Output Op Amps

C-Load is a trademark of Linear Technology Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Voltage Follower Input to Output ErrorMUX Amplifier

TYPICAL APPLICATION

–

LT1218L

OUT

IN1

IN2

INPUT

SELECT

74HCO4

1218/19 • TA01

SHDN

MAXIMUM IN 

TO OUT ERROR

= 110µV FOR 

0.05V ≤ V

≤ 4.8V

= 10k

SHDN

INPUT VOLTAGE (V)

ERROR (mV)

1234

LT1218/19 • TA02

= 5V

= 1

NO LOAD



1.0

0.1

0.01

0.05 4.95

MAX ERROR = 110µV

0.05V ≤ V

≤ 4.8V

Summary of content (16 pages)

PAGE 1
LT1218/LT1219 Precision Rail-to-Rail Input and Output Op Amps U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Rail-to-Rail Input and Output 90µV VOS(MAX) for VCM = V – to V + High Common Mode Rejection Ratio: 97dB Min C-LoadTM Stable Version (LT1219) High AVOL: 500V/mV Minimum Driving 10kΩ Load Wide Supply Range: 2V to ±15V (LT1218/LT1219) 2V to ±5V (LT1218L/LT1219L) Shutdown Mode: IS < 30µA Low Supply Current: 420µA Max Low Input Bias Current: 18nA Typical 300kHz Gain-Bandwidth Product (LT1218) Slew Rate
PAGE 2
LT1218/LT1219 W U U W W W Supply Voltage LT1218/LT1219 ................................................. ±18V LT1218L/LT1219L ............................................... ±8V Input Current ...................................................... ±15mA Output Short-Circuit Duration (Note 1) ......... Continuous Operating Temperature Range ................ – 40°C to 85°C Specified Temperature Range (Note 3) ... – 40°C to 85°C Storage Temperature Range .................
PAGE 3
LT1218/LT1219 ELECTRICAL CHARACTERISTICS TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, VSHDN = V +, unless otherwise noted. SYMBOL SR GBW PARAMETER Slew Rate (LT1218/LT1218L) (LT1219/LT1219L) Gain Bandwidth Product (LT1218/LT1218L) (LT1219/LT1219L) CONDITIONS AV = – 1 AV = – 1 MIN AV = 1000 AV = 1000 TYP 0.10 0.05 MAX 0.30 0.15 UNITS V/µs V/µs MHz MHz 0°C ≤ TA ≤ 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, VSHDN = V +, unless otherwise noted.
PAGE 4
LT1218/LT1219 ELECTRICAL CHARACTERISTICS – 40°C ≤ TA ≤ 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, VSHDN = V +, unless otherwise noted. (Note 3) SYMBOL AVOL PARAMETER Large-Signal Voltage Gain CMRR Common Mode Rejection Ratio PSRR VOL Power Supply Rejection Ratio Output Voltage Swing LOW VOH Output Voltage Swing HIGH ISC Short-Circuit Current IS Supply Current Positive Supply Current, SHDN CONDITIONS VS = 5V, VO = 50mV to 4.8V, RL = 10k VS = 3V, VO = 50mV to 2.
PAGE 5
LT1218/LT1219 ELECTRICAL CHARACTERISTICS LT1218L/LT1219L only; 0°C ≤ TA ≤ 70°C, VS = ±5V, VCM = 0V, VO = 0V, VSHDN = 5V, unless otherwise noted.
PAGE 6
LT1218/LT1219 ELECTRICAL CHARACTERISTICS LT1218/LT1219 only; TA = 25°C, VS = ±15V, VCM = 0V, VO = 0V, VSHDN = 15V, unless otherwise noted.
PAGE 7
LT1218/LT1219 ELECTRICAL CHARACTERISTICS LT1218/LT1219 only; 0°C ≤ TA ≤ 70°C, VS = ±15V, VCM = 0V, VO = 0V, VSHDN = 15V, unless otherwise noted. SYMBOL ISC IS PARAMETER Short-Circuit Current Supply Current Positive Supply Current, SHDN CONDITIONS ● MIN 8 ● VSHDN = 0V ● TYP 17 450 20 MAX 600 54 UNITS mA µA µA LT1218, LT1219 only; – 40°C ≤ TA ≤ 85°C, VS = ±15V; VCM = 0V = VO = 0V, VSHDN = 15V, unless otherwise noted.
PAGE 8
LT1218/LT1219 U W TYPICAL PERFORMANCE CHARACTERISTICS VOS Distribution, VCM = 0V VOS Shift, VCM = 0V to 5V 30 35 20 15 10 5 30 VS = 5V, 0V VCM = 0V TO 5V 25 30 PERCENT OF UNITS (%) VS = 5V, 0V VCM = 0V PERCENT OF UNITS (%) 25 20 15 10 0 –100 100 –60 –20 20 60 INPUT OFFSET VOLTAGE (µV) –60 20 60 –20 INPUT OFFSET VOLTAGE (µV) VS = ±2.
PAGE 9
LT1218/LT1219 U W TYPICAL PERFORMANCE CHARACTERISTICS Noise Voltage Spectrum 100 2.5 VS = 5V, 0V 90 VS = 5V, 0V 80 70 60 50 40 VCM = 4V 30 VCM = 2.5V 2.0 CURRENT NOISE (pA/√Hz) NOISE VOLTAGE (nV/√Hz) Noise Current Spectrum 20 1.5 1.0 VCM = 2.5V 0.5 VCM = 4V 10 0 0 10 100 FREQUENCY (Hz) 1 10 100 FREQUENCY (Hz) 1 1000 LT1218/19 • TPC11 LT1218/19 • TPC10 LT1218 Gain and Phase Shift vs Frequency LT1219 Gain and Phase Shift vs Frequency VS = ±2.
PAGE 10
LT1218/LT1219 U W TYPICAL PERFORMANCE CHARACTERISTICS LT1218 Power Supply Rejection Ratio vs Frequency 1000 VS = ±2.5V 90 1000 VS = ±2.5V 60 POSITIVE SUPPLY 50 40 30 20 100 AV = 10 10 AV = 1 1.0 AV = 10 10 AV = 1 1.0 NEGATIVE SUPPLY 10 10 100 FREQUENCY (kHz) 1 0.1 0.1 1000 1 10 100 FREQUENCY (kHz) LT1218/19 • TPC17 80 0.1 0.1 1000 1 10 100 FREQUENCY (kHz) LT1218/19 • TPC18 LT1219 Overshoot vs Load Current, VS = ±15V 70 70 VS = ±2.5V 70 VS = ±2.
PAGE 11
LT1218/LT1219 U W TYPICAL PERFORMANCE CHARACTERISTICS THD + Noise vs Peak-to-Peak Voltage 10 Small-Signal Response VS = ±15V Large-Signal Response VS = ±15V AV = 1 VS = ±15V AV = 1 VS = ±15V f = 1kHz RL = 10k (ALL CURVES) THD + NOISE (%) 1 VS = ±1.5V AV = –1 0.1 VS = ±1.5V AV = 1 VS = ±2.5V AV = 1 0.01 VS = ±2.5V AV = –1 0.
PAGE 12
LT1218/LT1219 U W U U APPLICATIONS INFORMATION output stage with rail-to-rail swing. The amplifier is fabricated on Linear Technology’s proprietary complementary bipolar process, which ensures very similar DC and AC characteristics for the output devices Q24 and Q26. ure 1) turns on, pulling the output of the second stage low, which forces the output high. For input below the negative supply, diodes D1 and D2 turn on, overcoming the saturation of the input pair Q1/Q2.
PAGE 13
LT1218/LT1219 U W U U APPLICATIONS INFORMATION Shutdown The biasing of the LT1218/LT1219 is controlled by the SHDN pin. When the SHDN pin is low, the part is shut down. In the shutdown mode, the output looks like a 40pF capacitor and the supply current is less than 30µA. The SHDN pin is referenced to the positive supply through an internal bias circuit (see Figure 1). The SHDN pin current with the pin low is typically 3µA.
PAGE 14
LT1218/LT1219 U U W U APPLICATIONS INFORMATION compensation. The output capacitance forms a filter, which reduces pickup from the supply and lowers the output impedance. This additional filtering is helpful in mixed analog/digital systems with common supplies or systems employing switching supplies. Filtering also reduces high frequency noise, which may be beneficial when driving A/D converters. positive supply.
PAGE 15
LT1218/LT1219 U TYPICAL APPLICATIONS Positive Supply Current Sense VCC R1 200Ω – RS 0.2Ω Q1 TP0610L LT1218 + ILOAD VO ( ) R2 VO = (ILOAD)(RS) R1 LOAD R2 20k = (ILOAD)(20Ω) 1218/19 • TA06 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.025 0.325 –0.015 8.255 +0.635 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.
PAGE 16
LT1218/LT1219 U TYPICAL APPLICATION 8-Channel, 12-Bit Data Acquisition System with Programmable Gain 5V 5V 1µF 1 2 3 4 INPUTS 5 6 7 8 CH0 CH1 CH2 16 V+ 15 D 14 V– 13 + 12 – CH3 DOUT CH4 DIN CH5 CS CH6 CLK CH7 GND 1µF LT1219L 5V 0.