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LT1469

1469fb

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual 90MHz, 22V/µs

16-Bit Accurate Operational Amplifier

The LT

1469 is a dual, precision high speed operational

ampliﬁer with 16-bit accuracy and 900ns settling to 150µV

for 10V steps. This unique blend of precision and AC

performance makes the LT1469 the optimum choice for

high accuracy applications such as DAC current-to-voltage

conversion and ADC buffers. The initial accuracy and drift

characteristics of the input offset voltage and inverting input

bias current are tailored for inverting applications.

The 90MHz gain bandwidth ensures high open-loop gain

at frequency for reducing distortion. In noninverting ap-

plications such as an ADC buffer, the low distortion and

DC accuracy allow full 16-bit AC and DC performance.

The 22V/µs slew rate of the LT1469 improves large signal

performance compared to other precision op amps in

applications such as active ﬁlters and instrumentation

ampliﬁers.

The LT1469 is available in a space saving 4mm × 4mm

leadless package, as well as in small outline and DIP pack-

ages. A single version, the LT1468, is also available.

16-Bit DAC I-to-V Converter and Reference Inverter for Bipolar Output Swing (V

OUT

= –10V to 10V)

90MHz Gain Bandwidth, f = 100kHz

Maximum Input Offset Voltage: 125µV

Settling Time: 900ns (A

= –1, 150µV, 10V Step)

22V/µs Slew Rate

Low Distortion: –96.5dB for 100kHz, 10V

P-P

Maximum Input Offset Voltage Drift: 3µV/°C

Maximum Inverting Input Bias Current: 10nA

Minimum DC Gain: 300V/mV

Minimum Output Swing into 2k: ±12.8V

Unity-Gain Stable

Input Noise Voltage: 5nV/√Hz

Input Noise Current: 0.6pA/√Hz

Total Input Noise Optimized for 1kΩ < R

< 20kΩ

Speciﬁed at ±5V and ±15V Supplies

Precision Instrumentation

High Accuracy Data Acquisition Systems

16-Bit DAC Current-to-Voltage Converter

ADC Buffer

Low Distortion Active Filters

Photodiode Ampliﬁers

Bipolar Multiplying Mode (LTC1597)

Signal-to-(Noise + Distortion)

15pF

2.4µs SETTLING TIME

TO 1LSB ON 20V STEP

LPF

LTC1597

16 BITS

DAC INPUTS

REF

1469 TA01

15pF

LPF

OUT

–

1/2 LT1469

12k12k

–15V

15V

FREQUENCY (Hz)

SIGNAL/(NOISE + DISTORTION) (dB)

10 1k 10k 100k

1469 TA01a

110

100

DAC INPUT CODE = ALL ZEROS

REF

= 20V

P-P

500kHz FILTER

80kHz FILTER

30kHz

FILTER

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Summary of content (20 pages)

PAGE 1
LT1469 Dual 90MHz, 22V/µs 16-Bit Accurate Operational Amplifier FEATURES n n n n n n n n n n n n n n DESCRIPTION 90MHz Gain Bandwidth, f = 100kHz Maximum Input Offset Voltage: 125µV Settling Time: 900ns (A V = –1, 150µV, 10V Step) 22V/µs Slew Rate Low Distortion: –96.5dB for 100kHz, 10VP-P Maximum Input Offset Voltage Drift: 3µV/°C Maximum Inverting Input Bias Current: 10nA Minimum DC Gain: 300V/mV Minimum Output Swing into 2k: ±12.8V Unity-Gain Stable Input Noise Voltage: 5nV/√Hz Input Noise Current: 0.
PAGE 2
LT1469 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V + to V–)..................................36V Input Current (Note 2)...........................................±10mA Output Short-Circuit Duration (Note 3)............. Indefinite Operating Temperature Range (Note 4).... –40°C to 85°C Specified Temperature Range (Note 5)..... –40°C to 85°C Maximum Junction Temperature........................... 150°C Storage Temperature Range....................
PAGE 3
LT1469 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted.
PAGE 4
LT1469 ELECTRICAL CHARACTERISTICS TA = 25°C. VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY tS Settling Time 10V Step, 0.01%, AV = –1 10V Step, 150µV, AV = –1 5V Step, 0.01%, AV = –1 ±15V ±15V ±5V 760 900 770 ns ns ns THD Total Harmonic Distortion AV = –1, VOUT = 10VP-P, f = 100kHz AV = 1, VOUT = 20VP-P, f = 1kHz ±15V ±15V –96.5 –125 dB dB ROUT Output Resistance AV = 1, f = 100kHz ±15V Channel Separation VOUT = ±12.5V, RL = 2k VOUT = ±2.
PAGE 5
LT1469 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, 0°C ≤ TA ≤ 70°C. VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOUT Maximum Output Swing RL = 10k RL = 2k RL = 10k RL = 2k VSUPPLY ±15V ±15V ±5V ±5V ● ● ● ● ±12.9 ±12.7 ±2.9 ±2.7 MIN TYP MAX UNITS V V V V IOUT Maximum Output Current VOUT = ±12.5V VOUT = ±2.5V ±15V ±5V ● ● ±12.5 ±12.5 mA mA ISC Output Short-Circuit Current VOUT = 0V, 0.
PAGE 6
LT1469 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, –40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS VSUPPLY CMRR Common Mode Rejection Ratio VCM = ±12.5V VCM = ±2.5V ±15V ±5V Minimum Supply Voltage Guaranteed by PSRR ● PSRR Power Supply Rejection Ratio VS = ±4.5V to ±15V ● 93 dB AVOL Large-Signal Voltage Gain VOUT = ±12,5V, RL = 10k VOUT = ±12.5V, RL = 2k VOUT = ±2.
PAGE 7
LT1469 TYPICAL PERFORMANCE CHARACTERISTICS Distribution of Input Offset Voltage Distribution of Inverting Input Bias Current 40 6 VS = ±15V TA = 25°C VS = ±15V TA = 25°C 30 20 10 0 75 125 –175 –125 –75 –25 25 INPUT OFFSET VOLTAGE (µV) 85°C 5 30 SUPPLY CURRENT (mA) 40 PERCENTAGE OF UNITS (%) PERCENTAGE OF UNITS (%) 50 20 10 0 –10 –7.5 –5 –2.5 0 2.5 5 7.5 INVERTING INPUT BIAS CURRENT (nA) 175 10 100 TOTAL NOISE VOLTAGE (nV/√Hz) 0.
PAGE 8
LT1469 TYPICAL PERFORMANCE CHARACTERISTICS –1.0 RL = 2k –2 –3 –4 4 3 2 RL = 2k 1 RL = 10k V– TA = 25°C 20 Output Short-Circuit Current vs Temperature 60 VS = ±15V 85°C 25°C –40°C –1.5 –2.0 –2.5 2.5 –40°C 2.0 1.5 25°C 85°C 1.0 10 15 5 SUPPLY VOLTAGE (±V) 0 Output Voltage Swing vs Load Current V– 0.
PAGE 9
LT1469 TYPICAL PERFORMANCE CHARACTERISTICS Gain Bandwidth and Phase Margin vs Supply Voltage ±5V 20 GAIN 20 –10 10k 100k 0 ±15V TA = 25°C AV = –1 RF = RG = 5.1k CF = 5pF RL = 2k –20 ±5V –40 1M 10M FREQUENCY (Hz) –60 100M 92 38 PHASE MARGIN 34 32 90 88 GAIN BANDWIDTH 86 84 82 10 5 15 SUPPLY VOLTAGE (±V) 0 1469 G19 3 Gain vs Frequency, AV = 1 GAIN (dB) 5 TA = 25°C AV = 1 RL = 2k VS = ±5V 1 VS = ±15V 0 RF = RG = 5.
PAGE 10
LT1469 TYPICAL PERFORMANCE CHARACTERISTICS 120 VS = ±15V TA = 25°C RL = 2k 140 COMMON MODE REJECTION RATIO (dB) +PSRR 100 –PSRR 80 60 40 20 0 100 1k 10k 1M 100k FREQUENCY (Hz) 10M 100 60 40 20 10k 100k 1M FREQUENCY (Hz) 1k 10M AV = 1 7 6 AV = –1 5 4 3 2 1 0 10 100 FREQUENCY (kHz) 1 25 20 10 VS = ±15V TA = 25°C RL = 2k THD < 1% 5 0 1000 AV = –1 15 10 100 FREQUENCY (kHz) 1 –120 –70 VS = ±15V –80 –100 1k 10k FREQUENCY (Hz) 100k 1469 G34 VS = ±15V TA = 25°C AV = 100 1 AV = 1
PAGE 11
LT1469 TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Transient, AV = 1 VS = ±15V Small-Signal Transient, AV = – 1 1469 G37 Large-Signal Transient, AV = 1 VS = ±15V VS = ±15V 1469 G38 Large-Signal Transient, AV = – 1 1469 G39 VS = ±15V 1469 G40 APPLICATIONS INFORMATION Layout and Passive Components The LT1469 requires attention to detail in board layout in order to maximize DC and AC performance.
PAGE 12
LT1469 APPLICATIONS INFORMATION the amplifier. Air currents over device leads should be minimized, package leads should be short and the two input leads should be as close together as possible and maintained at the same temperature. The parallel combination of the feedback resistor and gain setting resistor on the inverting input can combine with the input capacitance to form a pole which can cause peaking or even oscillations.
PAGE 13
LT1469 APPLICATIONS INFORMATION Capacitive Loading measurements—Application Notes 47 and 74. Appendix B of AN47 is a vital primer on 12-bit settling measurements and AN74 extends the state-of-the-art while concentrating on settling time with a 16-bit current output DAC input. The LT1469 drives capacitive loads of up to 100pF in unitygain and 300pF in a gain of –1. When there is a need to drive a larger capacitive load, a small series resistor should be inserted between the output and the load.
PAGE 14
LT1469 TYPICAL APPLICATIONS Ultralow Distortion Balanced Audio Line Driver + 10k 1/2 LT1364 – 2.1k 22pF 33.2Ω + 10k 1/2 LT1469 30.1Ω 820pF – 50 FEET SHIELDED TWISTED PAIR CABLE 1k INPUT 22pF ZIN = 10kΩ 600Ω + 20k 1/2 LT1469 30.1Ω 820pF THD + N MEASURED HERE – 22.1k 22pF VS = ±15V GAIN = 6dB 33.2Ω PARALLEL COMPOSITE TOPOLOGY: LT1364 PROVIDES OUTPUT CURRENT; LT1469 PRESERVES LINEARITY + 20k 1/2 LT1364 – 24.
PAGE 15
LT1469 TYPICAL APPLICATIONS Extending 16-Bit DAC Performance to 200V Output Swing 125V 1µF 510Ω VOUT = 200VP-P IOUT = 25mA THD + N = –90dB at 100Hz 330Ω Q1 2N5415 15V 10k 330pF Q3 2N3440* VREF 100pF 16 BITS LTC1597 50k – RFB – 1/2 LT1469 RSELECT*** TYPICAL 19.994k** 6Ω Q5 2N2222 1M OUTPUT + 1N4148 50k Q6 2N2907 1M –15V NOTE: FOR FURTHER EXPLANATION, REFER TO APPLICATION NOTE 74, APPENDIX H 27Ω 1N4148 1/2 LT1469 + *HEAT SINK **VISHAY S102 RESISTOR 0.
PAGE 16
LT1469 SIMPLIFIED SCHEMATIC V+ I1 I5 I2 Q10 Q8 +IN Q1 Q2 –IN Q5 Q9 Q7 Q3 I3 V– I4 OUT Q6 Q4 BIAS Q11 C I6 1469 SS 1469fb 16
PAGE 17
LT1469 PACKAGE DESCRIPTION DF Package 12-Lead Plastic DFN (4mm × 4mm) (Reference LTC DWG # 05-08-1733 Rev Ø) 2.50 REF 0.70 ±0.05 3.38 ±0.05 4.50 ± 0.05 3.10 ± 0.05 2.65 ± 0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 4.00 ± 0.10 (4 SIDES) 2.50 REF 7 12 0.40 ± 0.10 3.38 ±0.10 2.65 ± 0.10 PIN 1 NOTCH R = 0.20 TYP OR 0.35 × 45° CHAMFER PIN 1 TOP MARK (NOTE 6) 0.200 REF 6 R = 0.115 TYP 0.75 ± 0.
PAGE 18
LT1469 PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow 0.300) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 19
LT1469 REVISION HISTORY (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 1/11 Change to Electrical Characteristics 3, 5, 6 1469fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PAGE 20
LT1469 TYPICAL APPLICATION 16-Bit Accurate Single Ended to Differential ADC Buffer 5V 4096 Point FFT of ADC Output + 1/2 LT1469 0 100Ω 5V – 3000pF +IN 10pF 2k 16 BITS 333ksps ADC OUTPUTS LTC1604 –IN 2k 3000pF 1469 TA04 – 1/2 LT1469 100Ω fSAMPLE = 333ksps VIN = ±1.