
–12–
REV. 0
P
AD8631/AD8632
C
AD8632’s 5-lead SOT-23, 8-lead
μ
SOIC, 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
Z
O
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)
8
5
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)
8
5
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.