–12–

REV. 0

AD8631/AD8632

AD8632’s 5-lead SOT-23, 8-lead

µSOIC, and 8-lead SOIC

footprint and this circuit offers a compact solution.

6.2V

6.2V

TRANSMIT

TxA

RECEIVE

RxA

C1

0.1 F

R1

10k

R2

9.09k

2k

P1

Tx GAIN

ADJUST

A1

A2

A3

A4

A1, A2 = 1/2 AD8632

A3, A4 = 1/2 AD8632

R3

360

1:1

T1

TO TELEPHONE

LINE

1

2

3

7

6

5

2

3

1

6

5

7

10 F

R7

10k

R8

10k

R5

10k

R6

10k

R9

10k

R14

14.3k

R10

10k

R11

10k

R12

10k

R13

10k

C2

0.1 F

P2

Rx GAIN

ADJUST

2k

600

+1.8V DC

MIDCOM

671-8005

Figure 31. A Single-Supply Direct Access Arrangement

for Modems

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

8-Lead Narrow Body SOIC

(SO-8)

0.1968 (5.00)

0.1890 (4.80)

85

4

1

0.2440 (6.20)

0.2284 (5.80)

PIN 1

0.1574 (4.00)

0.1497 (3.80)

0.0688 (1.75)

0.0532 (1.35)

SEATING

PLANE

0.0098 (0.25)

0.0040 (0.10)

0.0192 (0.49)

0.0138 (0.35)

0.0500

(1.27)

BSC

0.0098 (0.25)

0.0075 (0.19)

0.0500 (1.27)

0.0160 (0.41)

8

0

0.0196 (0.50)

0.0099 (0.25)

45

5-Lead SOT-23

(RT-5)

0.1181 (3.00)

0.1102 (2.80)

PIN 1

0.0669 (1.70)

0.0590 (1.50)

0.1181 (3.00)

0.1024 (2.60)

1

3

4

5

0.0748 (1.90)

BSC

0.0374 (0.95) BSC

2

0.0079 (0.20)

0.0031 (0.08)

0.0217 (0.55)

0.0138 (0.35)

10

0

0.0197 (0.50)

0.0138 (0.35)

0.0059 (0.15)

0.0019 (0.05)

0.0512 (1.30)

0.0354 (0.90)

SEATING

PLANE

0.0571 (1.45)

0.0374 (0.95)

8-Lead

SOIC

(RM-8)

85

4

1

0.122 (3.10)

0.114 (2.90)

0.199 (5.05)

0.187 (4.75)

PIN 1

0.0256 (0.65) BSC

0.122 (3.10)

0.114 (2.90)

SEATING

PLANE

0.006 (0.15)

0.002 (0.05)

0.018 (0.46)

0.008 (0.20)

0.043 (1.09)

0.037 (0.94)

0.120 (3.05)

0.112 (2.84)

0.011 (0.28)

0.003 (0.08)

0.028 (0.71)

0.016 (0.41)

33

27

0.120 (3.05)

0.112 (2.84)

SPICE Model

The SPICE model for the AD8631 amplifier is available and

can be downloaded from the Analog Devices’ web site at

http://www.analog.com. The macro-model accurately simulates

a number of AD8631 parameters, including offset voltage, input

common-mode range, and rail-to-rail output swing. The output

voltage versus output current characteristics of the macro-model

is identical to the actual AD8631 performance, which is a critical

feature with a rail-to-rail amplifier model. The model also accurately

simulates many ac effects, such as gain-bandwidth product, phase

margin, input voltage noise, CMRR and PSRR versus frequency,

and transient response. Its high degree of model accuracy makes the

AD8631 macro-model one of the most reliable and true-to-life

models available for any amplifier.