Datasheet

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LTC6084/LTC6085

60845fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual/Quad 1.5MHz,

Rail-to-Rail, CMOS

Ampliﬁ ers

The LTC

6084/LTC6085 are dual/quad, low cost, low offset,

rail-to-rail input/output, unity-gain stable CMOS operational

ampliﬁ ers that feature 1pA of input bias current.

A 1.5MHz gain bandwidth, and 0.5V/s slew rate, along

with the wide supply range and a low 0.75mV offset, make

the LTC6084/LTC6085 useful in an extensive variety of ap-

plications from data acquisition to medical equipment and

consumer electronics. The 110A supply current and the

shutdown mode are ideal for signal processing applications

which demand performance with minimal power.

The LTC6084/LTC6085 have an output stage which swings

within 5mV of either supply rail to maximize signal dynamic

range in low supply applications. The input common

mode range includes the entire supply voltage. These op

amps are speciﬁ ed on power supply voltages of 2.5V and

5V from –40°C to 125°C. The dual ampliﬁ er LTC6084 is

available in 8-lead MSOP and 10-lead DFN packages. The

quad ampliﬁ er LTC6085 is available in 16-lead SSOP and

DFN packages.

Shock Sensor Ampliﬁ er

Low Offset Voltage: 750μV Maximum

Low Offset Drift: 5μV/°C Maximum

Low Input Bias Current:

1pA (Typical at 25°C)

40pA (≤85°C)

Rail-to-Rail Inputs and Outputs

2.5V to 5.5V Operation Voltage

Gain Bandwidth Product: 1.5MHz

CMRR: 70dB Minimum

PSRR: 94dB Minimum

Supply Current: 110µA per Ampliﬁ er

Shutdown Current: 1.1µA per Ampliﬁ er

Available in 8-Lead MSOP and 10-Lead DFN

Packages (LTC6084) and 16-Lead SSOP and DFN

Packages (LTC6085)

Portable Test Equipment

Medical Equipment

Consumer Electronics

Data Acquisition

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

All other trademarks are the property of their respective owners.

Input Bias Current

vs Common Mode Voltage

COMMON MODE VOLTAGE (V)

INPUT BIAS CURRENT (pA)

60845 TA01b

10000

1000

100

0.1

0.01

0 0.5 1 4.5 541.5 2 2.5 3 3.5

= 5V

= 125°C

= 85°CT

= 85°C

= 25°C

60845 TA01

–

0.22µF

470pF

20M

200k

100k

2k *

100k

*SHOCK SENSOR MURATA ERIE PKGS-OOMX1

www.murata.com

1/2

LTC6084

OUT

= 120mV/g

7Hz TO 5kHz

Summary of content (16 pages)

PAGE 1
LTC6084/LTC6085 Dual/Quad 1.5MHz, Rail-to-Rail, CMOS Amplifiers DESCRIPTION FEATURES n n n n n n n n n n n Low Offset Voltage: 750μV Maximum Low Offset Drift: 5μV/°C Maximum Low Input Bias Current: 1pA (Typical at 25°C) 40pA (≤85°C) Rail-to-Rail Inputs and Outputs 2.5V to 5.5V Operation Voltage Gain Bandwidth Product: 1.5MHz CMRR: 70dB Minimum PSRR: 94dB Minimum Supply Current: 110μA per Ampliﬁer Shutdown Current: 1.
PAGE 2
LTC6084/LTC6085 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V–) ...................................6V Input Voltage......................................................V – to V+ Input Current........................................................±10mA SHDNA/SHDNB Voltage .....................................V – to V+ Output Short-Circuit Duration (Note 2) ............ Indeﬁnite Operating Temperature Range (Note 3) LTC6084C/LTC6085C ...........................
PAGE 3
LTC6084/LTC6085 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6085CGN#PBF LTC6085CGN#TRPBF 6085 16-Lead Plastic SSOP 0°C to 70°C LTC6085HGN#PBF LTC6085HGN#TRPBF 6085 16-Lead Plastic SSOP –40°C to 125°C LTC6085CDHC#PBF LTC6085CDHC#TRPBF 6085 16-Lead (5mm × 3mm) Plastic DFN 0°C to 70°C LTC6085HDHC#PBF LTC6085HDHC#TRPBF 6085 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C Consult LTC Marketing for parts speciﬁed with wi
PAGE 4
LTC6084/LTC6085 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. Test conditions are V+ = 2.5V, V– = 0V, VCM = 0.5V unless otherwise noted. C SUFFIX SYMBOL PARAMETER CONDITIONS MIN TYP ISC Output Short-Circuit Current Source and Sink 7.7 6 12.5 SR Slew Rate AV = 1 GBW Gain Bandwidth Product (fTEST = 10kHz) RLOAD = 50k, VCM = 1.
PAGE 5
LTC6084/LTC6085 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. Test conditions are V+ = 5V, V– = 0V, VCM = 0.5V unless otherwise noted. C SUFFIX CONDITIONS H SUFFIX SYMBOL PARAMETER CMRR Common Mode Rejection 0 ≤ VCM ≤ 5V Ratio MIN TYP MIN TYP l 70 68 84 70 66 84 dB dB PSRR Power Supply Rejection Ratio VS = 2.5V to 5.
PAGE 6
LTC6084/LTC6085 TYPICAL PERFORMANCE CHARACTERISTICS VOS Distribution VOS vs VCM VS = 5V 0.8 TA = 25°C REPRESENTATIVE PARTS 0.6 PERCENT OF UNITS (%) LTC6084 MS8 18 VS = 5V VCM = 0.5V 16 T = 25°C A 14 100 UNITS 0.4 12 10 8 0.2 0.0 –0.2 6 –0.4 4 –0.6 2 –0.8 0 VOS Drift Distribution 1.0 VOS (mV) PERCENTAGE OF UNITS (%) 20 –1 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 VOS (mV) –1.0 1 0 0.5 1 1.5 2 2.5 3 VCM (V) 3.
PAGE 7
LTC6084/LTC6085 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Supply Current vs Temperature 140 140 120 PER AMPLIFIER VCM = 0.5V SUPPLY CURRENT (μA) SUPPLY CURRENT (μA) 130 100 80 60 40 0 0 0.5 1 1.5 2 2.5 3 3.5 4 TOTAL SUPPLY VOLTAGE (V) 4.5 VS = 5V 110 VS = 2.5V 100 PER AMPLIFIER VCM = 0.
PAGE 8
LTC6084/LTC6085 TYPICAL PERFORMANCE CHARACTERISTICS Capacitive Load Handling –90 50 OVERSHOOT (%) RS = 50Ω 25 20 1k 15 10 – + 1k 5 RS 100 1000 CAPACITIVE LOAD (pF) –105 –110 –115 –120 0.01 0.1 1 FREQUENCY (MHz) AV = 1, VIN = 1VP-P 0.001 0.01 10 0.01 AV = –2, VIN = 1VP-P 1 10 FREQUENCY (kHz) 100 Total Harmonic Distortion and Noise vs Load Resistance 0.1 VS = 3V AT 20kHz 0.1 VS = 5V AT 20kHz 0.01 VS = 3V AT 1kHz 0.001 AV = 1, VIN = 1VP-P 0.
PAGE 9
LTC6084/LTC6085 TYPICAL PERFORMANCE CHARACTERISTICS Large Signal Response Large Signal Response 1V/DIV Large Signal Response 1V/DIV 1V/DIV VS = 5V AV = –1 RL = 1k 20μs/DIV 60845 G27 VS = 5V AV = 1 RL = ∞ 20μs/DIV 60845 G28 VS = 5V AV = –1 RL = 1k 20μs/DIV 60845 G29 PIN FUNCTIONS OUT: Ampliﬁer Output. –IN: Inverting Input. +IN: Noninverting Input. V+: Positive Supply. V–: Negative Supply. SHDNB: Shutdown Pin of Ampliﬁer B, active low and only available with the LTC6084DD.
PAGE 10
LTC6084/LTC6085 APPLICATIONS INFORMATION OUT R NO SOLDER MASK OVER THE GUARD RING NO LEAKAGE CURRENT OUT LTC6084 IN– R LTC6084 R IN– VIN IN+ IN+ LEAKAGE CURRENT GUARD RING GND V– V– 60845 F01 60845 F02 Figure 1. Sample Layout. Unity-Gain Conﬁguration. Using Guard Ring to Shield High Impedance Input from Board Leakage Figure 2. Sample Layout. Inverting Gain Conﬁguration.
PAGE 11
LTC6084/LTC6085 APPLICATIONS INFORMATION SHDN Pins ESD Pins 5 and 6 are used for power shutdown of the LTC6084 in the DD package. If they are ﬂoating, internal current sources pull pins 5 and 6 to V+ and the ampliﬁers operate normally. In shutdown the ampliﬁer output is high impedance, and each ampliﬁer draws less than 1μA current. This feature allows the part to be used in muxed output applications as shown in Figure 3.
PAGE 12
LTC6084/LTC6085 SIMPLIFIED SCHEMATIC Simpliﬁed Schematic of the Ampliﬁer V+ R1 M10 R2 M11 M8 I1 1μA I2 V– C1 + – V+ A1 VBIAS D4 M5 V+ +IN V+ D7 V+ D3 OUTPUT CONTROL M6 M7 M1 M2 D8 –IN V– D5 D2 BIAS GENERATION SHDN A2 + – V– C2 D1 V– OUT D6 V– NOTE: SHDN IS ONLY AVAILABLE IN THE DFN PACKAGE M9 M4 M3 R3 V– R4 60845 SS TYPICAL APPLICATIONS Gain Selectable Ampliﬁer 5V 10k + A – VIN SHDNA 4.02k 1k 10k + – VOUT B SHDNB 24.
PAGE 13
LTC6084/LTC6085 PACKAGE DESCRIPTION DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) 0.675 ±0.05 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 6 3.00 ±0.10 (4 SIDES) 0.38 ± 0.10 10 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD) DFN 1103 5 0.200 REF 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 0.00 – 0.05 2.38 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD NOTE: 1.
PAGE 14
LTC6084/LTC6085 PACKAGE DESCRIPTION DHC Package 16-Lead Plastic DFN (5mm × 3mm) (Reference LTC DWG # 05-08-1706) 0.65 ±0.05 3.50 ±0.05 1.65 ±0.05 2.20 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 4.40 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 3.00 ±0.10 (2 SIDES) 9 0.40 ± 0.10 16 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH (DHC16) DFN 1103 8 0.200 REF 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 4.40 ±0.
PAGE 15
LTC6084/LTC6085 PACKAGE DESCRIPTION MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 ± 0.038 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 0.52 (.0205) REF 7 6 5 RECOMMENDED SOLDER PAD LAYOUT 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0.254 (.010) 0° – 6° TYP GAUGE PLANE 1 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 2 3 4 1.10 (.043) MAX 0.86 (.
PAGE 16
LTC6084/LTC6085 TYPICAL APPLICATION Bipolar Analog Isolation Ampliﬁer VCC 1M 1% 10pF OC1 VCC OC1 – + VIN 1M 1% 1M 3pF 2k +5V 1/2 LTC6084 OC1 OC2 10pF – + VOUT = VIN LTC6240HV –5V OC2 – + 1/2 LTC6084 GNDB 2k GNDA OC2 VCC = 5V, VIN = ±5V RELATIVE TO GNDA BW ≈ 40kHz, EITHER POLARITY LARGE SIGNAL TRANSITION DELAY ≈ 50μs SMALL SIGNAL DEAD ZONE: |VIN| ≤ 10mV OC1, OC2: AVAGO TECHNOLOGIES HCNR201 www.avagotech.