MICREL MIC7201BM5 Datasheet

MIC7201 Micrel

MIC7201

GainBlock™ Difference Amplifier

Preliminary Information

General Description

The MIC7201 difference amplifier is an analog gain block
designed to convert a differential signal to a signal-ended
signal. It features an extended common-mode range that
includes rail-to-rail input/output capabilities. The part is pack­aged in the SOT-23-5 IttyBitty™ package.

The MIC7201 is designed using the MIC7101 operational
amplifier plus well-matched monolithic resistors to provide a
unity-gain stable differential input to signal-ended output
amplifier that requires a minimum of external components.
Performance is guaranteed from 2.2V through 10V.

Features

• Operates from 2.2V to 10V

• ±1% typical gain error

• 0.6mA typical supply current at 2.2V

• 400kHz bandwidth

• Small SOT-23-5 package

• Suitable for driving capacitive loads

Applications

• Cellular telephones

• Digital audio systems

• Mobile communications

• Portable computers and PDAs

Ordering Information

Part Number Temperature Range Package

MIC7201BM5 –40°C to +85°C SOT-23-5

Other voltages available. Contact Micrel for details.

Block Diagram

IN+

IN–

50k

3

50k

4

MIC7201

100k

100k

V+

V–

2

V

IN–

OUT

1

50k

5

V

V

OUT

IN+

Difference Amplifier Behavior

The desired 100mV, 400Hz differential sinusoidal signal is shown applied to
inputs V
imposed on both V

These signals demonstrate the noise cancellation ability of the MIC7201.
The output (V
400Hz sine wave.

IN–

and V

. A 500mV, 5kHz square-wave “noise” signal is super-

IN+

and V

IN–

) shows the recovered single-ended 200mV peak-to-peak,

OUT

IN+

.

GainBlock is a trademark of Micrel, Inc.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com

December 1998 1 MIC7201

MIC7201 Micrel

Pin Configuration

Pin Description

Pin Number Pin Name Pin Function

1 OUT Amplifier Output: Single-ended output.
2 V+ Positive Supply: Positive power supply input.
3 IN+ Noniverting Input: In-phase differential input.
4 IN– Inverting Input: Out-of-phase differential input.
5 V– Ground: Power supply ground return.

IN+

OUTV+

13

2

A16

45

IN–

SOT-23-5

V–

Part
Identification

MIC7201 2 December 1998

MIC7201 Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (VV+–VV–).............................................12V

Differential Input Voltage (VV+–VV–) .................±(VV+–VV–)

I/O Pin Voltage (VIN, V

................................................ VV––0.3V to VV++0.3V

Junction Temperature (TJ) ...................................... +150°C

Storage Temperature (TS) ....................... –65°C to +150°C

Lead Temperature (soldering, 10 sec.) .....................260°C

OUT

), Note 2

Operating Ratings (Note 1)

Supply Voltage (VV+–VV–)............................ +2.2V to +10V

Input Voltage (V

Continuous Output Current ......................................±15mA

Junction Temperature (TJ) ......................... –40°C to +85°C

Max. Junction Temperature (T

Package Thermal Resistance (θJA), Note 4..........325°C/W

Max. Power Dissipation............................................ Note 3

IN+

, V

)................................... VV– to V

IN–

), Note 3 ...........+85°C

J(max)

ESD, Note 5.................................................................. 2kV

Electrical Characteristics (2.2V)

VV+ = 2.2V, VV– = 0V, VCM = V

Symbol Parameter Condition Min Typ Max Units

E

Z

TCV
R

IN

OS

Zero Error EZ = V
Input Offset Voltage Temp. Drift 14 µV/°C

Input Resistance 35 50 65 kΩ
CMRR Common-mode Rejection Ratio VCM = 0V to V
±PSRR Split-Supply Rejection Ratio V

+PSRR Single-Supply Rejection Ratio, V

Note 8

E
V

I

G
OUT

SC

Gain Error, Note 9 0.2V ≤ V

Output Voltage Swing output high, RL = 2k, 10 33 mV

Note 10 specified as VV+ – V

Output Short-Circuit Current sinking or sourcing, Note 6, Note 7 20 60 mA
BW Bandwidth –3dB point 400 kHz
SR Slew Rate 0.5 V/µs
THD Total Harmonic Distortion f = 1kHz 0.02 %

e

n

I

S

Input Referred Voltage Noise f = 1kHz 30

Supply Current no load 0.6 2.0 mA

= V+/2; RL = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted

OUT

– VV+/2 944mV

OUT

V+

= VV– = 1.1V to 2.5V, 50 dB

V+

VCM = 0V

= 2.2V to 5V, VV– = 0V, VCM = 1.1V 6 dB

V+

≤ 2.0V ±1%

OUT

OUT

output low, R

output high, R
specified as VV+ – V

output low, R

= 2k 10 33 mV

L

= 600Ω,33mV

L

OUT

= 600Ω 33 mV

L

f = 10kHz 0.02 %

65 dB

50 mV

50 mV

mV

mV

nV Hz/

V+

December 1998 3 MIC7201

MIC7201 Micrel

Electrical Characteristics (5V)

VV+ = +5V, VV– = 0V, VCM = V

Symbol Parameter Condition Min Typ Max Units

E

Z

TCV
R

IN

OS

Zero Error EZ = V
Input Offset Voltage Temp. Drift 14 µV/°C

Input Resistance 35 50 65 kΩ
CMRR Common-Mode Rejection Ratio VCM = 0V to V
±PSRR Split-Supply Rejection Ratio V

+PSRR Single-Supply Rejection Ratio, V

Note 8

E
V

G
OUT

Gain Error, Note 9 0.5V ≤ V

Output Voltage Swing output high, RL = 2k, 15 50 mV

Note 10 specified as VV+ – V

I

SC

Output Short-Circuit Current sinking or sourcing, Note 6, Note 7 40 110 mA
BW Bandwidth –3dB point 250 kHz
SR Slew Rate 0.5 V/µs
THD Total Harmonic Distortion f = 1kHz 0.02 %

e

n

I

S

Input Referred Voltage Noise f = 1kHz 30

Supply Current no load 0.8 2.8 mA

= V+/2; RL = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted

OUT

– VV+/2 26 100 mV

OUT

V+

= VV– = 2.5V to 5V, 50 dB

V+

VCM = 0V

= 5V to 10V, VV– = 0V, VCM = 2.5V 6 dB

V+

≤ 4.5V ±1%

OUT

OUT

output low, R

output high, R
specified as VV+ – V

output low, R

= 2k 15 50 mV

L

= 600Ω,50mV

L

OUT

= 600Ω 50 mV

L

f = 10kHz 0.02 %

65 dB

75 mV

75 mV

mV

mV

nV Hz/

Electrical Characteristics (10V)

VV+ = 10V, VV– = 0V, VCM = V

Symbol Parameter Condition Min Typ Max Units

E

Z

TCV
R

IN

OS

Zero Error EZ = V

Input Offset Voltage Temp. Drift 14 µV/°C

Input Resistance 35 50 65 kΩ
CMRR Common-Mode Rejection Ratio VCM = 0V to V
±PSRR Split-Supply Rejection Ratio V

+PSRR Single-Supply Rejection Ratio, V

Note 8

E

G

Gain Error, Note 9 0.5V ≤ V

= V+/2; RL = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted

OUT

– VV+/2 60 200 mV

OUT

V+

= VV– = 2.5V to 5V, 50 dB

V+

VCM = 0V

= 5V to 10V, VV– = 0V, VCM = 2.5V 6 dB

V+

≤ 9.5V ±1%

OUT

65 dB

MIC7201 4 December 1998

MIC7201 Micrel

Symbol Parameter Condition Min Typ Max Units

V

OUT

Output Voltage Swing output high, RL = 2k, 24 80 mV
Note 10 specified as VV+ – V

output low, R

= 2k 24 80 mV

L

OUT

120 mV

120 mV

output high, R
specified as VV+ – V

output low, R

I

SC

Output Short-Circuit Current sinking or sourcing, Note 6, Note 7 40 200 mA

= 600Ω,80mV

L

OUT

= 600Ω 80 mV

L

mV

mV

BW Bandwidth –3dB point 250 kHz
SR Slew Rate 0.5 V/µs
THD Total Harmonic Distortion f = 1kHz 0.02 %

f = 10kHz 0.02 %

e

n

I

S

Input Referred Voltage Noise f = 1kHz 30

nV Hz/

Supply Current no load 1.2 4.0 mA

Internal Op Amp Typical Characteristics

+2.2V ≤ VV+ ≤ 10V, VV– = 0V, VCM = V

Symbol Parameter Condition Min Typ Max Units

V

OS

TCV
I

B

I

OS

R

IN

OS

Input Offset Voltage 0.11 mV
Input Offset Voltage Drift 1.0 µV/°C
Input Bias Current 1.0 pA
Input Offset Current 0.5 pA

Input Resistance >1 TΩ
CMRR Common-Mode Rejection Ratio 0V ≤ VCM ≤ V
V

CM

Input Common-Mode Voltage input low –0.3 V

PSRR Power Supply Rejection Ratio V

= V+/2; RL = 1MΩ; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted

OUT

V+

80 dB

input high VV++0.3 V

= VV– = 1.1V to 1.65V, 60 dB

V+

VCM = 0V

General Note: Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing or statistical analysis.
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when

Note 2: I/O pin voltage is any external voltage to which an input or output is referenced.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T

Note 4: Thermal resistance, θJA, applies to a part soldered on a printed-circuit board.
Note 5: Human body model, 1.5k in series with 100pF.
Note 6: Short circuit may cause the device to exceed maximum allowable power dissipation. See Note 3.
Note 7: Shorting V
Note 8: Limited by internal bias-network resistors. Power supply must be “clean.” Power supply should be bypassed as shown in typical application

Note 9: The gain error specification applies to differential, inverting, and noninverting gains.
Note 10: Since the part is specified in a single-supply configuration, the output load (RL) is a Thevenin equivalent value. The actual load consists of 2 ×

operating the device outside its recommended operating ratings.

; the junction-to-ambient thermal
resistance, θJA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
PD = (T

circuit.

RL to ground and 2 × RL to the supply (V+).

– TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature.

J(max)

to V+ when V+ > 10V may damage the device.

OUT

J(max)

December 1998 5 MIC7201

MIC7201 Micrel

IN+

OUT

50k

100k

V+

50k

50k

100k

IN–

V–

MIC7201

1

2

3

4

5

V

V+

0.1µF

V

V

2

OUT

V+

=

V

V+

V+

2

Applications Information

Input Common Mode Voltage

The MIC7201 tolerates overdriving the inputs by at least
300mV beyond either rail without producing phase inversion.
If the absolute maximum input voltage is exceeded, the input
current should be limited to ±5mA to prevent reducing reliabil­ity. A 10kΩ series input resistor, used as a current limiter will
protect the input structure from voltages as large as 50V
above the supply or below ground.

Output Voltage Swing

IN+

V

IN

3

IN–

4

50k

50k

MIC7201

100k

100k

V–

OUT

1

50k

5

V

IN

V

=

OUT

2

Output resistance of the MIC7201 is symmetric; sink and
source output resistances are equal. Output voltage swing is
determined by the load and, given the approximate output
resistance, which may be readily calculated with the following
formula:

V

≈

I

and I

DROP

LOAD

can be determined from the V

LOAD

OUT

R

OUT

V

is the voltage dropped within the amplifier output

DROP

stage. V

DROP

(output swing) portion of the appropriate Electrical Character­istics table. I
minus V+/2 and divided by R

is equal to the typical output high voltage

LOAD

. For example, using the

LOAD

Electrical Characteristics DC (5V) table, the typical output
voltage drop using a 2kΩ load (connected to V+/2) is 0.015V,
which produces an I

of (2.5V – 0.015V) / 2kΩ ≈ 1.243mA.

LOAD

Then:

R

OUT

15mV

==≈12 1 2. Ω

1.243mA

1

V

V

V+

2

Figure 2. Gain of One-Half

50k

50k

100k

100k

V–

IN+

IN

3

IN–

4

MIC7201

Figure 3. Voltage Follower

V+

V+

V

V+

2

OUT

V

= V

OUT

1

50k

5

V

V+

2

IN

Driving Capacitive Loads

Driving a capacitive load introduces phase-lag into the output
signal, and this in turn reduces system phase margin. The
application that is least forgiving of reduced phase margin is
a unity gain amplifier. The MIC7201 typically can drive a
500pF capacitive load connected directly to its output.

V

SUPPLY

0.1µF

IN+

3

IN–

V

IN

4

50k

50k

MIC7201

100k

100k

V–

OUT

V

= –V

OUT

1

50k

5

IN

Digital

Input

DAC

0.1µF

I

OUT

I

0.1µF

OUT

4.7µF

MIC7201

0.1µF

0.1µF

V

OUT

R

L

Figure 4. Inverting Unity Gain

Figure 1. Audio DAC

Figure 5. Virtual Ground Generator

MIC7201 6 December 1998

MIC7201 Micrel

Package Information

1.90 (0.075) REF

0.95 (0.037) REF

3.02 (0.119)

2.80 (0.110)

0.50 (0.020)

0.35 (0.014)

1.75 (0.069)

1.50 (0.059)

1.30 (0.051)

0.90 (0.035)

0.15 (0.006)

0.00 (0.000)

SOT-23-5 (M5)

3.00 (0.118)

2.60 (0.102)

10°

0°

DIMENSIONS:

MM (INCH)

0.20 (0.008)

0.09 (0.004)

0.60 (0.024)

0.10 (0.004)

December 1998 7 MIC7201

MIC7201 Micrel

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 [phone] FAX + 1 [phone] WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

© 1998 Micrel Incorporated

MIC7201 8 December 1998