MAXIM MAX9914, MAX9917 Technical data

General Description

The single MAX9914/MAX9915 and dual MAX9916/
MAX9917 operational amplifiers feature maximized ratio
of gain bandwidth to supply current and are ideal for
battery-powered applications such as portable instru­mentation, portable medical equipment, and wireless
handsets. These CMOS op amps feature an ultra-low
1pA input bias current, rail-to-rail inputs and outputs,
low 20µA supply current, and operate from a single

1.8V to 5.5V supply. For additional power conservation,
the MAX9915/MAX9917 feature a low-power shutdown
mode that reduces supply current to 1nA, and puts the
amplifier outputs in a high-impedance state. These
devices are unity-gain stable with a 1MHz gain-band­width product.

The MAX9914 and MAX9915 are available in 5-pin and
6-pin SC70 packages, respectively. The MAX9916 is
available in an 8-pin SOT23 package, and the
MAX9917 in a 10-pin µMAX®package. All devices are
specified over the -40°C to +85°C extended operating
temperature range.

Applications

Portable Medical Devices

Portable Test Equipment

RF Tags

Laptops

Data-Acquisition Equipment

Features

♦ High 1MHz GBW

♦ Ultra-Low 20µA Supply Current

♦ Single 1.8V to 5.5V Supply Voltage Range

♦ Ultra-Low 1pA Input Bias Current

♦ Rail-to-Rail Input and Output Voltage Ranges

♦ Low ±200µV Input Offset Voltage

♦ Low 0.001µA Shutdown Current

♦ High-Impedance Output During Shutdown

(MAX9915/MAX9917)

♦ Unity-Gain Stable

♦ Available in Tiny SC70, SOT23, and µMAX

Packages

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail

I/O Op Amps with Shutdown

________________________________________________________________ Maxim Integrated Products 1

19-3407; Rev 1; 10/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-

TOP

MARK

MAX9914EXK+T

5 SC70-5 AGB

MAX9914EXK-T

5 SC70-5 AGB

MAX9915EXT+T

6 SC70-6 ACB

MAX9915EXT-T

6 SC70-6 ACB

MAX9916EKA+T

AEJZ

MAX9916EKA-T

AEJZ

MAX9917EUB

10 µMAX —

MAX9917EUB+

10 µMAX —

R1
47kΩ

R2
10kΩ

R

G

*

*OPTIONAL INPUT RESISTOR R

G,

IS FOR GAIN ADJUSTMENT

MICROPOWER, TWO-OP-AMP INSTRUMENTATION AMPLIFIER

R3
10kΩ

R4
47kΩ

GAIN = 1

+

R4
R2

FOR R1 = R4 AND R2 = R3

GAIN

=

(R1 + R2 + R3 + R4)

(R2 + R3)

MAX9916

V

SS

V

DD

3V

IN-

INB+

INA+

OUTA

OUT

INA-

OUTB

INB-

IN+

Typical Operating Circuit

Selector Guide

PART

AMPLIFIERS

PER

PACKAGE

SHUTDOWN

MODE

PACKAGE

MAX9914EXK-T

1No5 SC70-5

MAX9915EXT-T

1 Yes 6 SC70-6

MAX9916EKA-T

2No

8 SOT23-8

MAX9917EUB 2 Yes 10 µMAX

+Denotes lead-free package.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

PACKAGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C

-40°C to +85°C

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Power-Supply Voltage (VDDto VSS) ......................-0.3V to +6.0V

IN_+, IN_-, OUT_,

SHDN_............... (VSS- 0.3V) to (VDD+ 0.3V)

Current into IN_+, IN_- ......................................................±20mA

Output Short-Circuit Duration to V

DD

or VSS..............Continuous

Continuous Power Dissipation (T

A

= +70°C)

5-Pin SC70 (derate 3.1mW/°C above +70°C)............. 247mW

6-Pin SC70 (derate 3.1mW/°C above +70°C)............. 245mW

8-Pin SOT23 (derate 9.1mW/°C above +70°C)........... 727mW

10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW

Operating Temperature Range .......................... -40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range ............................-65°C to +150°C

Lead Temperature (soldering, 10s) ............................... +300°C

ELECTRICAL CHARACTERISTICS

(VDD= 1.8V to 5.5V, VSS= 0V, VCM= 0V, V

OUT

= VDD/ 2, RL= ∞ connected to VDD/ 2, SHDN_ = VDD, TA= +25°C, unless otherwise

noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range V

DD

Guaranteed by PSRR test 1.8 5.5 V

VDD = 1.8V 20

VDD = 5.5V 20 25

VDD = 1.8V 40

Supply Current I

DD

VDD = 5.5V 40 50

µA

Shutdown Supply Current

)

SHDN_ = GND, MAX9915/MAX9917

0.5 µA

Input Offset Voltage V

OS

±1mV

Input-Offset-Voltage Matching MAX9916/MAX9917

µV

Input Bias Current I

B

(Note 2) ±1

pA

Input Offset Current I

OS

(Note 2) ±1

pA

Common mode 1

Input Resistance R

IN

Differential mode, -1mV < VIN < +1mV 10

GΩ

Input Common-Mode Range V

CM

Guaranteed by CMRR test

V

SS

-

0.1

VDD +

0.1

V

Common-Mode Rejection Ratio CMRR -0.1V < VCM < VDD + 0.1V, VDD = 5.5V 70 80 dB

Power-Supply Rejection Ratio PSRR 1.8V < VDD < 5.5V 65 85 dB

25mV < V

OUT

< VDD - 25mV,

R

L

= 100kΩ, VDD = 5.5V

95

Open-Loop Gain A

VOL

100mV < V

OUT

< V

DD

- 100mV,

R

L

= 5kΩ, VDD = 5.5V

95

dB

RL = 100kΩ

5

RL = 5kΩ 50 70

Output-Voltage-Swing High V

OH

VDD - V

OUT

RL = 1kΩ

mV

RL = 100kΩ

5

RL = 5kΩ 50 70Output-Voltage-Swing Low V

OL

V

OUT

- V

SS

RL = 1kΩ

mV

Channel-to-Channel Isolation CH

ISO

Specified at DC, MAX9916/MAX9917

dB

Output Short-Circuit Current I

OUT(SC)

mA

I

DD(SHDN_

MAX9914/MAX9915

MAX9916/MAX9917

0.001

±0.2

±250

120

110

2.5

250

2.5

250

100

±15

±10
±10

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 1.8V to 5.5V, VSS= 0V, VCM= 0V, V

OUT

= VDD/ 2, RL= ∞ connected to VDD/ 2, SHDN_ = VDD, TA= +25°C, unless otherwise

noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VDD = 1.8V to 3.6V, MAX9915/MAX9917 0.4

SHDN_ Logic Low V

IL

VDD = 3.6V to 5.5V, MAX9915/MAX9917 0.8

V

VDD = 1.8V to 3.6V, MAX9915/MAX9917 1.4

SHDN_ Logic High V

IH

VDD = 3.6V to 5.5V, MAX9915/MAX9917 2

V

I

IL

1

SHDN_ Input Bias Current

I

IH

SHDN_ = VDD, MAX9915/MAX9917

nA

Output Leakage in Shutdown

)

SHDN_ = VSS, V

OUT

= 0V to VDD,

MAX9915/MAX9917

1

nA

Gain-Bandwidth Product 1

MHz

Phase Margin CL = 15pF 45

degrees

Gain Margin CL = 15pF 10 dB

Slew Rate

V/µs

AV = 1V/V 30

AV = 10V/V

RL = 5kΩ, AV = 1V/V

Capacitive-Load Stability (See
the D r i vi ng C ap aci ti ve Load s
S ecti on)

C

LOAD

No sustained
oscillations

pF

Input Voltage-Noise Density f = 1kHz

nV/√Hz

Input Current-Noise Density f = 1kHz

pA/√Hz

Settling Time To 0.1%, V

OUT

= 2V step, AV = -1V/V

µs

Delay Time to Shutdown t

SH

IDD = 5% of normal operation,
V

DD

= 5.5V, V

SHDN_

= 5.5V to 0 step

2µs

Delay Time to Enable t

EN

V

OUT

= 2.7V, V

OUT

settles to 0.1%,

V

DD

= 5.5V, V

SHDN_

= 0 to 5.5V step

10 µs

Power-Up Time VDD = 0 to 5.5V step 2 µs

ELECTRICAL CHARACTERISTICS

(VDD= 1.8V to 5.5V, VSS= 0V, VCM= 0V, V

OUT

= VDD/ 2, RL= ∞ connected to VDD/ 2, SHDN_ = VDD, TA= -40°C to +85°C, unless

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range V

DD

Guaranteed by PSRR test 1.8 5.5 V

29

Supply Current I

DD

VDD = 5.5V

60

µA

Shutdown Supply Current

)

SHDN_ = GND, MAX9915/MAX9917 1 µA

Input Offset Voltage V

OS

±3mV

Inp ut- O ffset- V ol tag e Tem p er atur e
C oeffi ci ent

TC

VOS

±5

µV/°C

I

SHDN_ = VSS, MAX9915/MAX9917 (Note 2)

OUT(SHDN_

R

= 1kΩ, AV = 1V/V 100

ISO

500

500

0.5

100

100

160

0.001

3.5

I

DD(SHDN_

MAX9914/MAX9915

MAX9916/MAX9917

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

4 _______________________________________________________________________________________

Note 1: Specifications are 100% tested at TA= +25°C (exceptions noted). All temperature limits are guaranteed by design.
Note 2: Guaranteed by design, not production tested

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 1.8V to 5.5V, VSS= 0V, VCM= 0V, V

OUT

= VDD/ 2, RL= ∞ connected to VDD/ 2, SHDN_ = VDD, TA= -40°C to +85°C, unless

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Bias Current I

B

pA

Input Offset Current I

OS

pA

Input Common-Mode Range V

CM

Guaranteed by CMRR test

V

SS

-

VDD +

V

Common-Mode Rejection Ratio CMRR -0.05V < VCM < VDD + 0.05V, VDD = 5.5V 60 dB

Power-Supply Rejection Ratio PSRR 1.8V < VDD < 5.5V 60 dB

25mV < V

OUT

< V

DD

- 25mV,

R

L

= 100kΩ, VDD = 5.5V

85

Open-Loop Gain A

VOL

150mV < V

OUT

< VDD - 150mV,

R

L

= 5kΩ, VDD = 5.5V

85

dB

RL = 100kΩ 6

Output-Voltage-Swing High V

OH

VDD - V

OUT

RL = 5kΩ 90

mV

RL = 100kΩ 5

Output-Voltage-Swing Low V

OL

V

OUT

- V

SS

RL = 5kΩ 90

mV

VDD = 1.8V to 3.6V, MAX9915/MAX9917 0.4

SHDN_ Logic Low V

IL

VDD = 3.6V to 5.5V, MAX9915/MAX9917 0.8

V

VDD = 1.8V to 3.6V, MAX9915/MAX9917 1.4

SHDN_ Logic High V

IH

VDD = 3.6V to 5.5V, MAX9915/MAX9917 2

V

I

IL

SHDN_ = VSS, MAX9915/MAX9917 5 nA

SHDN_ Input Bias Current

I

IH

SHDN_ = VDD, MAX9915/MAX9917

nA

Output Leakage in Shutdown

(

)

SHDN_ = VSS, V

OUT

= 0V to VDD,

MAX9915/MAX9917

nA

±30

±20

I

SHDN_

OUT

0.05

0.05

1000

1000

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

_______________________________________________________________________________________ 5

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

MAX9914 toc04

TEMPERATURE (°C)

V

OS

(µV)

603510-15

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

-200

-40 85

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX9914 toc05

TEMPERATURE (°C)

I

B

(pA)

603510-15

-2

-1

0

1

2

3

4

5

6

7

-3

-40 85

IB+

IB-

INPUT BIAS CURRENT

vs. INPUT COMMON-MODE VOLTAGE

MAX9914 toc06

VCM (V)

I

B

(pA)

3.02.51.5 2.00.5 1.00

-4

-3

-2

-1

0

1

2

3

4

5

-5

-0.5 3.5
FREQUENCY (Hz)

PSRR (dB)

1k100101

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-100

0.1 10k

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX9914 toc07

COMMON-MODE REJECTION RATIO

vs. TEMPERATURE

MAX9914 toc08

TEMPERATURE (°C)

CMRR (dB)

603510-15

20

40

60

80

100

120

140

0

-40 85
FREQUENCY (Hz)

CMRR (dB)

10k1k10010

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-100
1 100k

COMMON-MODE REJECTION RATIO

vs. FREQUENCY

MAX9914 toc09

Typical Operating Characteristics

(VDD= 3V, VSS= VCM= 0V, RL to VDD/ 2, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9914 toc01

V

SUPPLY

(V)

I

CC

(µA)

4.84.13.32.6

5

10

15

20

25

30

35

40

45

50

0

1.8 5.5

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

DUAL

SINGLE

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX9914 toc02

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (nA)

603510-15

-4

-2

0

2

4

6

8

10

12

-6

-40 85

INPUT OFFSET VOLTAGE

vs. INPUT COMMON-MODE VOLTAGE

MAX9914 toc03

VCM (V)

V

OS

(µV)

2.52.00.5 1.0 1.5

-750

-500

-250

0

250

500

750

1000

-1000
0 3.0

TA = +25°C

TA = -40°C

TA = +85°C

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

6 _______________________________________________________________________________________

OPEN-LOOP GAIN

vs. TEMPERATURE (R

L

TO VSS)

MAX9914 toc13

TEMPERATURE (°C)

A

VOL

(dB)

603510-15

20

40

60

80

100

120

140

0

-40 85

RL = 1kΩ

RL = 5kΩ

RL = 100kΩ

20

40

60

80

120

100

140

160

0

OPEN-LOOP GAIN

vs. TEMPERATURE (R

L

TO VDD)

MAX9914 toc14

TEMPERATURE (°C)

A

VOL

(dB)

603510-15-40 85

RL = 1kΩ

RL = 5kΩ

RL = 100kΩ

GAIN AND PHASE

vs. FREQUENCY (R

L

= ∞, C

LOAD

= 15pF)

MAX9914 toc15

FREQUENCY (Hz)

GAIN (dB)

PHASE (DEGREES)

1M100k1k 10k10010

-100

-80

-60

-40

-20

0

20

40

60

80

100

-120

-225

-180

-135

-90

-45

0

45

90

135

180

225

-270

1 10M

GAIN

AV = 1000V/V

PHASE

CROSSTALK vs. FREQUENCY

MAX9914 toc17

FREQUENCY (Hz)

CROSSTALK (dB)

10k1k100

-100

-80

-60

-40

-20

0

-120
10 100k

MAX9916/MAX9917

GAIN AND PHASE

vs. FREQUENCY (R

L

= 5kΩ, C

LOAD

= 100pF)

MAX9914 toc16

FREQUENCY (Hz)

GAIN (dB)

PHASE (DEGREES)

1M100k1k 10k10010

-100

-80

-60

-40

-20

0

20

40

60

80

100

-120

-225

-180

-135

-90

-45

0

45

90

135

180

225

-270

1 10M

GAIN

AV = 1000V/V

PHASE

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. FREQUENCY

MAX9914 toc18

FREQUENCY (Hz)

THD+N (dB)

1k100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-100
10 10k

V

OUT

= 2V

P-P

Typical Operating Characteristics (continued)

(VDD= 3V, VSS= VCM= 0V, RL to VDD/ 2, TA= +25°C, unless otherwise noted.)

SLEW RATE vs. SUPPLY VOLTAGE

MAX9914 toc10

SUPPLY VOLTAGE (V)

SLEW RATE (V/µs)

4.83.82.8

-1.0

-0.5

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

-1.5

1.8 5.5

OUTPUT-SWING HIGH

vs. TEMPERATURE

MAX9914 toc11

TEMPERATURE (°C)

OUTPUT VOLTAGE SWING (mV)

603510-15

10

100

1000

1

-40 85

RL = 1kΩ

RL = 5kΩ

RL = 100kΩ

RL TO V

SS

VOH = VDD - V

OUT

OUTPUT-SWING LOW

vs. TEMPERATURE

MAX9914 toc12

TEMPERATURE (°C)

OUTPUT VOLTAGE SWING (mV)

603510-15

10

100

1000

1

-40 85

RL = 1kΩ

RL = 5kΩ

RL = 100kΩ

RL TO V

DD

VOL = V

OUT

- V

SS

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

_______________________________________________________________________________________ 7

VOLTAGE-NOISE DENSITY

vs. FREQUENCY

MAX9914 toc19

FREQUENCY (Hz)

VOLTAGE NOISE (nV/√Hz)

10 100 1k 10k

1000

10,000

100

1 100k

RESISTOR ISOLATION

vs. CAPACITIVE LOAD

MAX9914 toc20

C

LOAD

(pF)

R

ISO

(Ω)

1000100

500

1000

1500

2000

2500

3000

0

10 10,000

AV = 1V/V
FOR A

V

= 10V/V NO R

ISO

NEEDED

POWER-UP SETTLING TIME

MAX9914 toc21

1µs/div

OUTPUT

500mV/div

V

DD

1V/div

IN+ = VDD / 2
A

V

= 1V/V

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX9914 toc23

FREQUENCY (Hz)

GAIN (dB)

1M100k10k

-8

-6

-4

-2

0

2

4

6

8

10

-10
1k 10M

AV = 1V/V
V

OUT

= 100mV

P-P

C

LOAD

= 15pF

SHUTDOWN RESPONSE

MAX9914 toc22

20µs/div

OUTPUT

SHDN = 3V

3V

0V

0V

1.5V

IN+ = VDD / 2
A

V

= 1V/V

10010

-3

-2

-1

0

1

2

3

4

-4
1 1000

LARGE-SIGNAL GAIN

vs. FREQUENCY

MAX9914 toc24

FREQUENCY (kHz)

GAIN (dB)

AV = 1V/V
V

OUT

= 2V

P-P

C

LOAD

= 15pF

Typical Operating Characteristics (continued)

(VDD= 3V, VSS= VCM= 0V, RL to VDD/ 2, TA= +25°C, unless otherwise noted.)

SMALL-SIGNAL PULSE RESPONSE

(C

LOAD

= 15pF)

MAX9914 toc25

1µs/div

OUTPUT

50mV/div

IN+

50mV/div

AV = 1V/V

SMALL-SIGNAL PULSE RESPONSE

(C

LOAD

= 100pF)

MAX9914 toc26

5µs/div

OUTPUT

50mV/div

IN+

5mV/div

AV = 10V/V

PERCENT OVERSHOOT
vs. CAPACITIVE LOAD

MAX9914 toc29

C

LOAD

(pF)

OVERSHOOT (%)

80604020

2

3

4

5

6

7

1

0 100

RL = 1MΩ

RL = 100kΩ

RL = 10kΩ

OUTPUT WAVEFORM WITH R

ISO

(C

LOAD

= 47pF, R

ISO

= 2.3kΩ)

MAX9914 toc30

5µs/div

OUTPUT

50mV/div

INPUT

50mV/div

AV = 1V/V

OUTPUT WAVEFORM WITHOUT R

ISO

(C

LOAD

= 47pF)

MAX9914 toc31

5µs/div

OUTPUT

50mV/div

IN+

50mV/div

AV = 1V/V

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

8 _______________________________________________________________________________________

LARGE-SIGNAL PULSE RESPONSE

(C

LOAD

= 15pF)

MAX9914 toc27

5µs/div

OUTPUT

1V/div

IN+

1V/div

AV = 1V/V

LARGE-SIGNAL PULSE RESPONSE

(C

LOAD

= 100pF)

MAX9914 toc28

5µs/div

OUTPUT

1V/div

IN+

100mV/div

AV = 10V/V

Typical Operating Characteristics (continued)

(VDD= 3V, VSS= VCM= 0V, RL to VDD/ 2, TA= +25°C, unless otherwise noted.)

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

_______________________________________________________________________________________ 9

Detailed Description

Featuring a maximized ratio of gain bandwidth to
supply current, low operating supply voltage, low input
bias current, and rail-to-rail inputs and outputs, the
MAX9914–MAX9917 are an excellent choice for preci­sion or general-purpose low-current, low-voltage, bat­tery-powered applications. These CMOS devices
consume an ultra-low 20µA (typ) supply current and a
200µV (typ) offset voltage. For additional power
conservation, the MAX9914/MAX9917 feature a low­power shutdown mode that reduces supply current to
1nA (typ), and puts the amplifiers’ output in a high­impedance state. These devices are unity-gain stable
with a 1MHz gain-bandwidth product driving capacitive
loads up to 30pF. The capacitive load can be
increased to 100pF when the amplifier is configured for
a 10V/V gain.

Rail-to-Rail Inputs and Outputs

The MAX9914–MAX9917 amplifiers all have a parallel­connected n- and p-channel differential input stage that
allows an input common-mode voltage range that
extends 100mV beyond the positive and negative sup­ply rails, with excellent common-mode rejection.

The MAX9914–MAX9917 are capable of driving the out­put to within 5mV of both supply rails with a 100kΩ load.
These devices can drive a 5kΩ load with swings to within
60mV of the rails. Figure 1 shows no clipping at the out­put voltage swing of the MAX9914–MAX9917 configured
as a unity-gain buffer powered from a single 3V supply.

Low Input Bias Current

The MAX9914–MAX9917 feature ultra-low 1pA (typ)
input bias current. The variation in the input bias
current is minimal with changes in the input voltage due
to very high input impedance (in the order of 1GΩ).

Applications Information

Driving Capacitive Loads

The MAX9914–MAX9917 amplifiers are unity-gain
stable for loads up to 30pF. However, the capacitive
load can be increased to 100pF when the amplifier is
configured for a minimum gain of 10V/V.

Applications that require greater capacitive drive
capability should use an isolation resistor between the
output and the capacitive load (Figure 2). Also, in
unity-gain applications with relatively small RL(about
5kΩ), the capacitive load can be increased up to 100pF.

PIN

MAX9914 MAX9915 MAX9916 MAX9917

NAME FUNCTION

11——IN+ Noninverting Amplifier Input

2244V

SS

Negative Supply Voltage

33——IN- Inverting Amplifier Input

44——OUT Amplifier Output

56810VDDPositive Supply Voltage

—5——SHDN Shutdown

—— 11OUTA Amplifier Output Channel A

—— 22INA- Inverting Amplifier Input Channel A

—— 33INA+ Noninverting Amplifier Input Channel A

——— 5SHDNA Shutdown Channel A

——— 6SHDNB Shutdown Channel B

—— 57INB+ Noninverting Amplifier Input Channel B

—— 68INB- Inverting Amplifier Input Channel B

—— 79OUTB Amplifier Output Channel B

Pin Description

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

10 ______________________________________________________________________________________

Power-Supply Considerations

The MAX9914–MAX9917 are optimized for single 1.8V
to 5.5V supply operation. A high amplifier power-supply
rejection ratio of 85dB (typ) allows the devices to be
powered directly from a battery, simplifying design and
extending battery life.

Power-Up Settling Time

The MAX9914–MAX9917 typically require 2µs after
power-up. Supply settling time depends on the supply
voltage, the value of the bypass capacitor, the output
impedance of the incoming supply, and any lead resis­tance or inductance between components. Op amp
settling time depends primarily on the output voltage
and is slew-rate limited. Figure 3 shows the MAX991_ in
a noninverting voltage follower configuration with the
input held at midsupply. The output settles in approxi­mately 3.5µs for VDD= 3V (see the Typical Operating
Characteristics for the Power-Up Settling Time graph).

Shutdown Mode

The MAX9915 and MAX9917 feature active-low shut­down inputs. The MAX9915 and MAX9917 enter shut­down in 2µs (typ) and exit shutdown in 10µs (typ). The
amplifiers’ outputs are high impedance in shutdown
mode. Drive SHDN low to enter shutdown. Drive SHDN
high to enable the amplifier. The MAX9917 dual amplifi­er features separate shutdown inputs. Shut down both
amplifiers for lowest quiescent current.

Power-Supply Bypassing and Layout

Bypass VDDwith a 0.1µF capacitor to ground as close
to the pin as possible to minimize noise.

Good layout techniques optimize performance by
decreasing the amount of stray capacitance and induc­tance to the op amp’s inputs and outputs. Minimize
stray capacitance and inductance, by placing external
components close to the IC.

Figure 1. Rail-to-Rail Output Voltage Range

RAIL-TO-RAIL OUTPUT VOLTAGE RANGE

200µs/div

3V

0V

3V

0V

IN_
1V/div

OUT_
1V/div

VDD = 3V

Figure 2. Using a Resistor to Isolate a Capacitive Load from
the Op Amp

MAX9914–
MAX9917

R

ISO

C

L

R

L

AV = ≈ 1V/V

R

L

RL + R

ISO

Figure 3. Power-Up Test Configuration

MAX991_

100kΩ

100kΩ

OUT

IN-

IN+

0V

5.5V

V

DD

V

SS

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

______________________________________________________________________________________ 11

VDD8

OUTB7

INB-6

INB+

5

1OUTA

INA+

3

INA-

2

V

SS

4

V

SS

OUTIN-

15V

DD

IN+

MAX9914

SC70

TOP VIEW

2

34

V

SS

OUTIN-

16V

DD

IN+

MAX9915

SC70

2

34

SHDN5

SHDN

MAX9916

SOT23

VDD10

OUTB9

INB-8

SHDNB

6

INB+

7

1OUTA

2INA-

V

SS

4

INA+

3

SHDNA

5

MAX9917

µMAX

SHDNA

SHDNB

Pin Configurations

Chip Information

MAX9914 TRANSISTOR COUNT: 180

MAX9915 TRANSISTOR COUNT: 180

MAX9916 TRANSISTOR COUNT: 292

MAX9917 TRANSISTOR COUNT: 292

PROCESS: BiCMOS

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

12 ______________________________________________________________________________________

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SC70, 5L.EPS

PACKAGE OUTLINE, 5L SC70

21-0076

1

1

C

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps

with Shutdown

______________________________________________________________________________________ 13

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SC70, 6L.EPS

PACKAGE OUTLINE, 6L SC70

21-0077

1

1

C

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown

14 ______________________________________________________________________________________

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SOT23, 8L .EPS

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

3.002.60E

C

E1

E

BETWEEN 0.08mm AND 0.15mm FROM LEAD TIP.

8. MEETS JEDEC MO178.

8∞

0.60

1.75

0.30

L2

0∞

e1

e

L

1.50E1

0.65 BSC.

1.95 REF.

0.25 BSC.

GAUGE PLANE

SEATING PLANE C

C

L

PIN 1

I.D. DOT

(SEE NOTE 6)

L

C

L

C

A2

e1

D

DETAIL "A"

5. COPLANARITY 4 MILS. MAX.

NOTE:

7. SOLDER THICKNESS MEASURED AT FLAT SECTION OF LEAD

6. PIN 1 I.D. DOT IS 0.3 MM ÿ MIN. LOCATED ABOVE PIN 1.

4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING.

3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL BURR.

HEEL OF THE LEAD PARALLEL TO SEATING PLANE C.

2. FOOT LENGTH MEASURED FROM LEAD TIP TO UPPER RADIUS OF

1. ALL DIMENSIONS ARE IN MILLIMETERS.

L2

L

A1

A

0.45

1.30

0.15

1.45

MAX

0.28b

0.90A2

0.00A1

0.90

A

MIN

SYMBOL

3.00

0.20

2.80D

0.09

C

SEE DETAIL "A"

L

C

b

e

D

1

21-0078

1

PACKAGE OUTLINE, SOT-23, 8L BODY

0

0

MAX9914–MAX9917

1MHz, 20µA, Rail-to-Rail

I/O Op Amps with Shutdown

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15

© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

10LUMAX.EPS

PACKAGE OUTLINE, 10L uMAX/uSOP

1

1

21-0061

I

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

TOP VIEW

FRONT VIEW

1

0.498 REF

0.0196 REF

S

6°

SIDE VIEW

α

BOTTOM VIEW

0° 0° 6°

0.037 REF

0.0078

MAX

0.006

0.043

0.118

0.120

0.199

0.0275

0.118

0.0106

0.120

0.0197 BSC

INCHES

1

10

L1

0.0035

0.007

e

c

b

0.187

0.0157

0.114
H
L

E2

DIM

0.116

0.114

0.116

0.002

D2
E1

A1

D1

MIN

-A

0.940 REF

0.500 BSC

0.090

0.177

4.75

2.89

0.40

0.200

0.270

5.05

0.70

3.00

MILLIMETERS

0.05

2.89

2.95

2.95

-

MIN

3.00

3.05

0.15

3.05

MAX

1.10

10

0.6±0.1

0.6±0.1

Ø0.50±0.1

H

4X S

e

D2

D1

b

A2

A

E2

E1

L

L1

c

α

GAGE PLANE

A2 0.030 0.037 0.75 0.95

A1