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AD628AR-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
AD628
Rev. G | Page 18 of 20
CURRENT LOOP RECEIVER
Analog data transmitted on a 4 to 20 mA current loop can be
detected with the receiver shown in
Figure 33. The AD628 is an
ideal choice for such a function because the current loop is
driven with a compliance voltage sufficient to stabilize the loop,
and the resultant common-mode voltage often exceeds commonly
used supply voltages. Note that with large shunt values, a resistance
of equal value must be inserted in series with the inverting
input to compensate for an error at the noninverting input.
MONITORING BATTERY VOLTAGES
Figure 34 illustrates how the AD628 is used to monitor a battery
charger. Voltages approximately eight times the power supply
voltage can be applied to the input with no damage. The resistor
divider action is well suited for the measurement of many
power supply applications, such as those found in battery
chargers or similar equipment.
For proper operation, the common-mode voltage must satisfy
the input specifications in
Tabl e 1, as well as Equation 2.
6
8
1
4
5
7 23
AD628
+15V
+2.5V 9.53k
–15V
10k
0V TO 5V
TO ADC
I = 4 TO 20mA
100k
210k 100k
100k249
V
CM
= 15V
10k
10k
2
49
02992-031
Figure 33. Level Shifter for 4 to 20 mA Current Loop
+IN
–IN
G=+0.1
10k
A1
–IN
100k
V
REF
–5V
–IN
A2
OUT
AD628
100k
10k
CHARGING
CIRCUIT
+1.5V
BATTERY
10k
+IN
nV
BAT
(V)
R
EXT1
10k
TO ADC
C
FILT
R
G
02992-032
OTHER
BATTERIES IN
CHARGING
CIRCUIT
+5V
+IN
Figure 34. Battery Voltage Monitor
AD628
Rev. G | Page 19 of 20
FILTER CAPACITOR VALUES
Connect a capacitor to Pin 4 (C
FILT
) to implement a low-pass
filter. The capacitor value is
C = 15.9/f
t
(µF)
where f
t
is the desired 3 dB filter frequency.
Table 7 shows several frequencies and their closest standard
capacitor values.
Table 7. Capacitor Values for Various Filter Frequencies
Frequency (Hz) Capacitor Value (μF)
10 1.5
50 0.33
60 0.27
100 0.15
400 0.039
1 k 0.015
5 k 0.0033
10 k 0.0015
KELVIN CONNECTION
In certain applications, it may be desirable to connect the
inverting input of an amplifier to a remote reference point.
This eliminates errors resulting in circuit losses in inter-
connecting wiring. The AD628 is particularly suited for this
type of connection. In
Figure 35, a 10 kΩ resistor added in the
feedback matches the source impedance of A2. This is
described in more detail in the
Gain Adjustment section.
+IN
–IN
A2
+V
S
–IN
+IN
V
REF
OUT
CIRCUIT
LOSS
LOAD
+IN
–IN
G = +0.1
A1
AD628
–V
S
10k
10k10k100k
100k
V
S
/2
C
FILT
R
G
10k
02992-033
Figure 35. Kelvin Connection
AD628
Rev. G | Page 20 of 20
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-187-AA
0.80
0.60
0.40
8°
0°
4
8
1
5
PIN 1
0.65 BSC
SEATING
PLANE
0.38
0.22
1.10 MAX
3.20
3.00
2.80
COPLANARITY
0.10
0.23
0.08
3.20
3.00
2.80
5.15
4.90
4.65
0.15
0.00
0.95
0.85
0.75
Figure 36. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-012-A A
012407-A
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 37. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model Temperature Range Description Package Option Branding
AD628AR −40°C to +85°C 8-Lead SOIC_N R-8
AD628AR-REEL −40°C to +85°C 8-Lead SOIC_N 13" Reel R-8
AD628AR-REEL7 −40°C to +85°C 8-Lead SOIC_N 7" Reel R-8
AD628ARZ
1
−40°C to +85°C 8-Lead SOIC_N R-8
AD628ARZ-RL
1
−40°C to +85°C 8-Lead SOIC_N 13" Reel R-8
AD628ARZ-R7
1
−40°C to +85°C 8-Lead SOIC_N 7" Reel R-8
AD628ARM −40°C to +85°C 8-Lead MSOP RM-8 JGA
AD628ARM-REEL −40°C to +85°C 8-Lead MSOP 13" Reel RM-8 JGA
AD628ARM-REEL7 −40°C to +85°C 8-Lead MSOP 7" Reel RM-8 JGA
AD628ARMZ
1
−40°C to +85°C 8-Lead MSOP RM-8 JGZ
AD628ARMZ-RL
1
−40°C to +85°C 8-Lead MSOP 13" Reel RM-8 JGZ
AD628ARMZ-R7
1
−40°C to +85°C 8-Lead MSOP 7" Reel RM-8 JGZ
AD628-EVAL Evaluation Board
1
Z = RoHS Compliant Part.
©2002–2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C02992-0-4/07(G)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD628AR-REEL

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Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Hi CM Vltg Gain Prog
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