Datasheet

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LT1498/LT1499

14989fg

TYPICAL APPLICATION

DESCRIPTION

10MHz, 6V/µs, Dual/Quad

Rail-to-Rail Input and Output

Precision C-Load Op Amps

The LT

1498/LT1499 are dual/quad, rail-to-rail input and

output precision C-Load™ op amps with a 10MHz gain-

bandwidth product and a 6V/μs slew rate.

The LT1498/LT1499 are designed to maximize input

dynamic range by delivering precision performance over

the full supply voltage. Using a patented technique, both

input stages of the LT1498/LT1499 are trimmed, one at

the negative supply and the other at the positive supply.

The resulting guaranteed common mode rejection is much

better than other rail-to-rail input op amps. When used as

a unity-gain buffer in front of single supply 12-bit A-to-D

converters, the LT1498/LT1499 are guaranteed to add less

than 1LSB of error even in single 3V supply systems.

With 110dB of supply rejection, the LT1498/LT1499 main-

tain their performance over a supply range of 2.2V to 36V

and are speciﬁ ed for 3V, 5V and ±15V supplies. The inputs

can be driven beyond the supplies without damage or phase

reversal of the output. These op amps remain stable while

driving capacitive loads up to 10,000pF.

The LT1498 is available with the standard dual op amp

conﬁ guration in 8-pin PDIP and SO packaging. The LT1499

features the standard quad op amp conﬁ guration and is

available in a 14-pin plastic SO package. These devices

can be used as plug-in replacements for many standard

op amps to improve input/output range and precision.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load

is a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

FEATURES

APPLICATIONS

Rail-to-Rail Input and Output

475μV Max V

from V

to V

–

Gain-Bandwidth Product: 10MHz

Slew Rate: 6V/μs

Low Supply Current per Ampliﬁ er: 1.7mA

Input Offset Current: 65nA Max

Input Bias Current: 650nA Max

Open-Loop Gain: 1000V/mV Min

Low Input Noise Voltage: 12nV/√Hz Typ

Wide Supply Range: 2.2V to ±15V

Large Output Drive Current: 30mA

Stable for Capacitive Loads Up to 10,000pF

Dual in 8-Pin PDIP and SO Package

Quad in Narrow 14-Pin SO

Driving A-to-D Converters

Active Filters

Rail-to-Rail Buffer Ampliﬁ ers

Low Voltage Signal Processing

Battery-Powered Systems

Frequency Response

Single Supply 100kHz 4th Order Butterworth Filter

–

1/2 LT1498

6.81k

OUT

1498 TA01

330pF

11.3k

6.81k

–

1/2 LT1498

5.23k 47pF

1000pF

10.2k

5.23k

100pF

FREQUENCY (Hz)

100

GAIN (dB)

–50

–30

–10

1498 TA02

–70

–90

–60

–40

–20

–80

–100

–110

10k

100k

10M

= 2.7V

P-P

= 3V

Summary of content (24 pages)

PAGE 1
LT1498/LT1499 10MHz, 6V/µs, Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps DESCRIPTION FEATURES n n n n n n n n n n n n n n Rail-to-Rail Input and Output 475μV Max VOS from V+ to V– Gain-Bandwidth Product: 10MHz Slew Rate: 6V/μs Low Supply Current per Ampliﬁer: 1.7mA Input Offset Current: 65nA Max Input Bias Current: 650nA Max Open-Loop Gain: 1000V/mV Min Low Input Noise Voltage: 12nV/√Hz Typ Wide Supply Range: 2.
PAGE 2
LT1498/LT1499 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V–) .................................36V Input Current........................................................ ±10mA Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range LT1498/LT1499 ....................................–40°C to 85°C LT1498H/LT1499H ............................. –40°C to 125°C LT1498MP .........................................
PAGE 3
LT1498/LT1499 ELECTRICAL CHARACTERISTICS otherwise noted.
PAGE 4
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range 0°C < TA < 70°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ VCM = V– + 0.1V l l 175 175 650 650 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ l l 0.5 1.5 2.5 4.0 μV/°C μV/°C ΔVOS Input Offset Voltage Shift VCM = V– + 0.
PAGE 5
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –40°C < TA < 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ VCM = V– + 0.1V l l 250 250 750 750 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ l l 0.5 1.5 2.5 4.0 μV/°C μV/°C ΔVOS Input Offset Voltage Shift VCM = V– + 0.
PAGE 6
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –40°C < TA < 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ – 0.5V VCM = V– + 0.5V l l 300 300 1100 1100 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ – 0.5V l l 0.5 1.5 ΔVOS Input Offset Voltage Shift VCM = V– + 0.5V to V+ – 0.
PAGE 7
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –55°C < TA < 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ – 0.5V VCM = V– + 0.5V l l 300 300 1100 1100 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ – 0.5V l l 0.5 1.5 ΔVOS Input Offset Voltage Shift VCM = V– + 0.5V to V+ – 0.
PAGE 8
LT1498/LT1499 ELECTRICAL CHARACTERISTICS SYMBOL TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
PAGE 9
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range 0°C < TA < 70°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ VCM = V– + 0.1V l l 200 200 900 900 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ l l 1.0 2.0 3.5 5.0 μV/°C μV/°C ΔVOS Input Offset Voltage Shift VCM = V– + 0.
PAGE 10
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –40°C < TA < 85°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ VCM = V– + 0.1V l l 300 300 950 950 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ l l 1.0 2.0 3.5 5.0 μV/°C μV/°C ΔVOS Input Offset Voltage Shift VCM = V– + 0.
PAGE 11
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –40°C < TA < 125°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ – 0.5V VCM = V– + 0.5V l l 350 350 1300 1300 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ – 0.5V l l 1.0 2.0 ΔVOS Input Offset Voltage Shift VCM = V– + 0.5V to V+ – 0.
PAGE 12
LT1498/LT1499 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the temperature range –55°C < TA < 125°C. VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = V+ – 0.5V VCM = V– + 0.5V l l MIN 350 350 1300 1300 μV μV VOS TC Input Offset Voltage Drift (Note 3) VCM = V+ – 0.5V l l 1.0 2.0 ΔVOS Input Offset Voltage Shift VCM = V– + 0.5V to V+ – 0.
PAGE 13
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS VOS Distribution, VCM = 0V (PNP Stage) VOS Distribution VCM = 5V (NPN Stage) LT1498: N8, S8 PACKAGES LT1499: S14 PACKAGE VS = 5V, 0V VCM = 0V 20 PERCENT OF UNITS (%) 15 10 5 25 LT1498: N8, S8 PACKAGES LT1499: S14 PACKAGE VS = 5V, 0V VCM = 5V 15 10 5 0 –500 –300 100 300 –100 INPUT OFFSET VOLTAGE (μV) –300 100 300 –100 INPUT OFFSET VOLTAGE (μV) 14989 G01 SUPPLY CURRENT PER AMPLIFIER (mA) SUPPLY CURRENT PER AMPLIFIER (mA) TA = –55°C 1.0 0.
PAGE 14
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS 0.1Hz to 10Hz Output Voltage Noise Minimum Supply Voltage Noise Voltage Spectrum 200 VS = p2.5V VCM = 0V 250 150 100 TA = 85°C 50 TA = 25°C TA = 70°C NONFUNCTIONAL TA = –55°C 120 VCM = 2.5V PNP ACTIVE 100 80 VCM = 4V NPN ACTIVE 60 40 20 4 2 3 TOTAL SUPPLY VOLTAGE (V) 5 0 40 VOLTAGE GAIN (dB) 7 5 4 VCM = 4V NPN ACTIVE 2 VCM = 2.5V PNP ACTIVE 0 1 10 100 FREQUENCY (Hz) 1000 PHASE 30 0 GAIN 10 –36 –72 0 –10 –108 –20 –144 –30 0.
PAGE 15
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS 70 60 VOUT = 80% OF VS AV = –1 8 SLEW RATE (V/μs) OVERSHOOT (%) 10 9 VS = 5V, 0V AV = 1 RL = 1k 50 40 30 20 NONINVERTING RISING EDGE 6 FALLING EDGE 5 INVERTING 4 2 0 –2 –4 INVERTING –6 4 NONINVERTING –8 0 10 1000 10000 100 CAPACITIVE LOAD (pF) –10 3 100000 8 12 16 20 24 28 32 TOTAL SUPPLY VOLTAGE (V) 4 0 14989 G19 1.
PAGE 16
LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS 5V Large-Signal Response 1V/DIV 5mV/DIV 5V Small-Signal Response 14989 G27 VS = 5V 200ns/DIV AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k VS = 5V 2μs/DIV AV = 1 VIN = 4VP-P AT 10kHz RL = 1k ±15V Large-Signal Response 5V/DIV 5mV/DIV ±15V Small-Signal Response 14989 G28 VS = p15V 200ns/DIV AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k 14989 G29 VS = p15V 2μs/DIV AV = 1 VIN = 20VP-P AT 10kHz RL = 1k 14989 G30 14989fg 16
PAGE 17
LT1498/LT1499 APPLICATIONS INFORMATION Rail-to-Rail Input and Output The LT1498/LT1499 are fully functional for an input and output signal range from the negative supply to the positive supply. Figure 1 shows a simpliﬁed schematic of the ampliﬁer. The input stage consists of two differential ampliﬁers, a PNP stage (Q1/Q2) and an NPN stage (Q3/Q4) which are active over different ranges of input common mode voltage.
PAGE 18
LT1498/LT1499 APPLICATIONS INFORMATION Overdrive Protection Capacitive Load To prevent the output from reversing polarity when the input voltage exceeds the power supplies, two pair of crossing diodes D1 to D4 are employed. When the input voltage exceeds either power supply by approximately 700mV, D1/D2 or D3/D4 will turn on, forcing the output to the proper polarity. For the phase reversal protection to work properly, the input current must be less than 5mA.
PAGE 19
LT1498/LT1499 TYPICAL APPLICATIONS 1A Voltage Controlled Current Source 0.5Ω V+ 1k 500pF – 1k VIN 100Ω 1/2 LT1498 Si9430DY + IOUT V+ – VIN 0.5Ω tr < 1μs RL IOUT = 14989 TA03 1A Voltage Controlled Current Sink V+ V+ 1k VIN IOUT + RL 100Ω 1/2 LT1498 Si9410DY – 500pF 1k 0.5Ω VIN 0.
PAGE 20
LT1498/LT1499 PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 p .015* (6.477 p 0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 8.255 +0.889 –0.381 .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .100 (2.54) BSC .130 p .005 (3.302 p 0.127) .120 (3.048) .020 MIN (0.508) MIN .018 p .003 (0.457 p 0.076) N8 1002 NOTE: 1.
PAGE 21
LT1498/LT1499 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 p.005 8 .245 MIN .160 p.005 .010 – .020 s 45o (0.254 – 0.508) NOTE: 1. DIMENSIONS IN 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .053 – .069 (1.346 – 1.752) 0o– 8o TYP .016 – .050 (0.406 – 1.270) 6 .228 – .244 (5.791 – 6.197) .030 p.005 TYP .008 – .010 (0.203 – 0.254) 7 .014 – .019 (0.
PAGE 22
LT1498/LT1499 PACKAGE DESCRIPTION S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 p.005 .050 BSC 14 N .245 MIN 12 11 10 9 8 N .160 p.005 .228 – .244 (5.791 – 6.197) 1 .030 p.005 TYP 13 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 s 45o (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 1 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.
PAGE 23
LT1498/LT1499 REVISION HISTORY (Revision history begins at Rev E) REV DATE DESCRIPTION PAGE NUMBER E 10/09 Edit in Absolute Maximum Ratings F 01/10 Added LT1498H/LT1499H (H-Grade) Parts. Reﬂected throughout the data sheet. G 03/10 Updated Part Markings in Order Information Section Updated Conditions for AVOL in Electrical Characteristics Section 2 2-24 2 6, 7 14989fg Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
PAGE 24
LT1498/LT1499 TYPICAL APPLICATION Bidirectional Current Sensor A1 forces a voltage equal to (IL)(RSENSE) across RA. This voltage is then ampliﬁed at the Charge Out by the ratio of RB over RA. In this mode, the output of A2 remains high, keeping Q2 off and the Discharge Out low, even though the (+) input of A2 exceeds the positive power supply. During the discharge cycle, A2 and Q2 are active and the operation is similar to the charge cycle.