Analog Devices AD630 Datasheet

CM OFF

ADJ

CM OFF

ADJ

DIFF OFF

ADJ

DIFF OFF

ADJ

6

34

5

2.5k⍀

AMP A

2.5k⍀

AMP B

–V

10k⍀

10k⍀

17

5k⍀

8

9

10

COMP

19

18

1

15

7

16

14

13

11

12

RINA

CHA+

CHA–

R

IN

B

CHB+

CHB–

SEL B

SEL A

2

20

COMP

+V

S

V

OUT

R

B

R

F

R

A

CHANNEL
STATUS
B/A

–V

S

AD630

A

B

a

Balanced Modulator/Demodulator

AD630

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Recovers Signal from +100 dB Noise
2 MHz Channel Bandwidth
45 V/␮s Slew Rate
–120 dB Crosstalk @ 1 kHz
Pin Programmable Closed Loop Gains of ⴞ1 and ⴞ2

0.05% Closed Loop Gain Accuracy and Match
100 ␮V Channel Offset Voltage (AD630BD)
350 kHz Full Power Bandwidth
Chips Available

PRODUCT DESCRIPTION

The AD630 is a high precision balanced modulator which com­bines a flexible commutating architecture with the accuracy and
temperature stability afforded by laser wafer trimmed thin-film
resistors. Its signal processing applications include balanced
modulation and demodulation, synchronous detection, phase
detection, quadrature detection, phase sensitive detection,
lock-in amplification and square wave multiplication. A network
of on-board applications resistors provides precision closed loop
gains of ± 1 and ± 2 with 0.05% accuracy (AD630B). These
resistors may also be used to accurately configure multiplexer
gains of +1, +2, +3 or +4. Alternatively, external feedback may
be employed allowing the designer to implement his own high
gain or complex switched feedback topologies.

The AD630 may be thought of as a precision op amp with two
independent differential input stages and a precision comparator
which is used to select the active front end. The rapid response
time of this comparator coupled with the high slew rate and fast
settling of the linear amplifiers minimize switching distortion. In
addition, the AD630 has extremely low crosstalk between chan­nels of –100 dB @ 10 kHz.

The AD630 is intended for use in precision signal processing
and instrumentation applications requiring wide dynamic range.
When used as a synchronous demodulator in a lock-in amplifier
configuration, it can recover a small signal from 100 dB of inter­fering noise (see lock-in amplifier application). Although optimized
for operation up to 1 kHz, the circuit is useful at frequencies up
to several hundred kilohertz.

Other features of the AD630 include pin programmable frequency
compensation, optional input bias current compensation resis­tors, common-mode and differential-offset voltage adjustment,
and a channel status output which indicates which of the two
differential inputs is active. This device is now available to Stan­dard Military Drawing (DESC) numbers 5962-8980701RA and
5962-89807012A.

REV. C

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

PRODUCT HIGHLIGHTS

1. The configuration of the AD630 makes it ideal for signal
processing applications such as: balanced modulation and
demodulation, lock-in amplification, phase detection, and
square wave multiplication.

2. The application flexibility of the AD630 makes it the best
choice for many applications requiring precisely fixed gain,
switched gain, multiplexing, integrating-switching functions,
and high-speed precision amplification.

3. The 100 dB dynamic range of the AD630 exceeds that of any
hybrid or IC balanced modulator/demodulator and is compa­rable to that of costly signal processing instruments.

4. The op-amp format of the AD630 ensures easy implementa­tion of high gain or complex switched feedback functions.
The application resistors facilitate the implementation of
most common applications with no additional parts.

5. The AD630 can be used as a two channel multiplexer with
gains of +1, +2, +3 or +4. The channel separation of
100 dB @ 10 kHz approaches the limit which is achievable
with an empty IC package.

6. The AD630 has pin-strappable frequency compensation (no
external capacitor required) for stable operation at unity gain
without sacrificing dynamic performance at higher gains.

7. Laser trimming of comparator and amplifying channel offsets
eliminates the need for external nulling in most cases.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

AD630–SPECIFICATIONS

Model AD630J/A AD630K/B AD630S

Min Typ Max Min Typ Max Min Typ Max Unit

GAIN

Open Loop Gain 90 110 100 120 90 110 dB
± 1, ± 2 Closed Loop Gain Error 0.1 0.05 0.1 %
Closed Loop Gain Match 0.1 0.05 0.1 %
Closed Loop Gain Drift 2 2 2 ppm/°C

CHANNEL INPUTS

VIN Operational Limit
Input Offset Voltage 500 100 500 µV
Input Offset Voltage

T

to T

MIN

Input Bias Current 100 300 100 300 100 300 nA
Input Offset Current 10 50 10 50 10 50 nA
Channel Separation @ 10 kHz 100 100 100 dB

COMPARATOR

Operational Limit

V

IN

Switching Window ⴞ1.5 ⴞ1.5 ⴞ1.5 mV
Switching Window

T
Input Bias Current 100 300 100 300 100 300 nA
Response Time (–5 mV to +5 mV Step) 200 200 200 ns
Channel Status

I

SINK

Pull-Up Voltage (–VS + 33 V) (–VS + 33 V) (–VS + 33 V) Volts

DYNAMIC PERFORMANCE

Unity Gain Bandwidth 2 2 2 MHz
Slew Rate
Settling Time to 0.1% (20 V Step) 3 3 3 µs

OPERATING CHARACTERISTICS

Common-Mode Rejection 85 105 90 110 90 110 dB
Power Supply Rejection 90 110 90 110 90 110 dB
Supply Voltage Range ⴞ5 ± 16.5 ⴞ5 ± 16.5 ⴞ5 ±16.5 Volts
Supply Current 4 5 4 5 4 5 mA

OUTPUT VOLTAGE, @ RL = 2 kΩ

T

MIN

Output Short Circuit Current 25 25 25 mA

TEMPERATURE RANGES

Rated Performance–N Package 0 +70 0 +70 N/A °C

Rated Performance–D Package –25 +85 –25 +85 –55 +125 °C

NOTES

1

If one terminal of each differential channel or comparator input is kept within these limits the other terminal may be taken to the positive supply.

2

These parameters are guaranteed but not tested for J and K grades. For A, B and S grades they are tested.

3

I

@ VOL = (–VS + 1) volt is typically 4 mA.

SINK

4

Pin 12 Open. Slew rate with Pins 12 and 13 shorted is typically 35 V/µs.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min

and max specifications are guaranteed, although only those shown in boldface are tested on all production units.

MAX

to T

MIN

MAX

@ VOL = –VS + 0.4 V

4

to T

MAX

1

1

2

3

2

(–VS + 4 V) to (+VS – 1 V) (–VS + 4 V) to (+VS – 1 V) (–VS + 4 V) to (+VS – 1 V) Volts

(–VS + 3 V) to (+VS – 1.5 V) (–VS + 3 V) to (+VS – 1.5 V) (–VS + 3 V) to (+VS – 1.3 V) Volts

1.6 1.6 1.6 mA

ⴞ10 ⴞ10 ± 10 Volts

(@ + 25ⴗC and ⴞVS = ⴞ15 V unless otherwise noted)

800 160 1000 µV

ⴞ2.0 ⴞ2.0 ⴞ2.5 mV

45 45 45 V/µs

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .± 18 V

Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . 600 mW

Output Short Circuit to Ground . . . . . . . . . . . . . . . . Indefinite

Storage Temperature, Ceramic Package . . . . –65°C to +150°C

Storage Temperature, Plastic Package . . . . . . –55°C to +125°C

Lead Temperature Range (Soldering, 10 sec ) . . . . . . . +300°C

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

THERMAL CHARACTERISTICS

θ

JC

θ

JA

20-Pin Plastic DIP (N) 24°C/W 61°C/W
20-Pin Ceramic DIP (D) 35°C/W 120°C/W
20-Pin Leadless Chip Carrier (E) 35°C/W 120°C/W

ORDERING GUIDE

Temperature Package Package

Model Ranges Descriptions Options

AD630JN 0°C to +70°C Plastic DIP N-20
AD630KN 0°C to +70°C Plastic DIP N-20
AD630AD –25°C to +85°C Side Brazed DIP D-20
AD630BD –25°C to +85°C Side Brazed DIP D-20
AD630SD –55°C to +125°C Side Brazed DIP D-20
AD630SD/883B –55°C to +125°C Side Brazed DIP D-20
5962-8980701RA –55°C to +125°C Side Brazed DIP D-20
AD630SE/883B –55°C to +125°C LCC E-20A
5962-89807012A –55°C to +125°C LCC E-20A
AD630JCHIPS 0°C to +70°C Chip
AD630SCHIPS –55°C to +125°C Chip

–2–

REV. C

AD630

FREQUENCY – Hz

120

60

0

1M100

100

80

20

40

10 1k 100k10k

UNCOMPENSATED

10M

0

45

90

OPEN LOOP GAIN – dB

135

180

COMPENSATED

OPEN LOOP PHASE – Degrees

CHIP METALIZATION AND PINOUT

Dimensions shown in inches and (mm).

Contact factory for latest dimensions

CHIP AVAILABILITY

The AD630 is available in laser trimmed, passivated chip form.
The figure shows the AD630 metalization pattern, bonding pads
and dimensions. AD630 chips are available; consult factory for
details.

Typical Performance Characteristics

CHANNEL STATUS B/A

DIFF OFF ADJ

CHANNEL STATUS B/A

PIN CONFIGURATIONS

20-Lead DIP (D-20 and N-20)

RINA

1

CH A+

2

–V

SEL B

SEL A

3

4

5

6

7

8

S

9

10

AD630

TOP VIEW

(Not to Scale)

DIFF OFF ADJ

DIFF OFF ADJ

CM OFF ADJ

CM OFF ADJ

20-Contact LCC (E-20A)

A

IN

CH A+

OFF ADJ

R

20 19123

AD630

TOP VIEW

(Not to Scale)

S

+V

SEL B

SEL A

CH A–

COMP

CM OFF ADJ

CM OFF ADJ

–V

4

5

6

7

8

S

DIFF

910111213

V

20

19

18

17

16

15

14

13

12

11

CH B–

OUT

CH A–

CH B–

CH B+

RIN B

R

A

R

F

R

B

V

OUT

COMP

+V

S

18

17

16

15

14

CH B+

R

B

IN

R

A

R

F

R

B

15

R

= 2k⍀

L

C

= 100pF

L

10

V

i

5

OUTPUT VOLTAGE – ⴞV

1k 10k 1M

5k⍀5k⍀

2k⍀

100pF

FREQUENCY – Hz

Figure 1. Output Voltage vs.
Frequency

120

100

80

60

40

20

COMMON MODE REJECTION – dB

0

110

100 1k 10k

Figure 4. Common-Mode

FREQUENCY – Hz

Rejection vs. Frequency

REV. C

V

O

100k

100k

15

CL = 100pF

V

5k⍀

i

CAP IN

f = 1kHz

5k⍀

10

5

OUTPUT VOLTAGE – ⴞV

1

100 1k 10k 100k 1M

10

RESISTIVE LOAD – ⍀

Figure 2. Output Voltage vs.
Resistive Load

60

UNCOMPENSATED

40

20

– V/␮s

0

DV

O

dt

–20

–40

–60

–5 –3

–4

Figure 5.

–2 –1

INPUT VOLTAGE – V

dV

dt

COMPENSATED

1

023 5

O

vs. Input Voltage

–3–

18

5k⍀

5k⍀

V

15

i

2k⍀

10

V

R

O

L

100pF

5

OUTPUT VOLTAGE – ⴞV

0 5 10 15

SUPPLY VOLTAGE – ⴞV

V

100pF

f = 1kHz
C

O

= 100pF

L

Figure 3. Output Voltage Swing
vs. Supply Voltage

4

Figure 6. Gain and Phase vs.
Frequency