AD204 Analog Devices, AD204 Datasheet

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AD204

Manufacturer Part Number
AD204
Description
Manufacturer
Analog Devices
Datasheet

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a
GENERAL DESCRIPTION
The AD202 and AD204 are general purpose, two-port, trans-
former-coupled isolation amplifiers that may be used in a broad
range of applications where input signals must be measured,
processed and/or transmitted without a galvanic connection.
These industry standard isolation amplifiers offer a complete
isolation function, with both signal and power isolation provided
for in a single compact plastic SIP or DIP style package. The
primary distinction between the AD202 and the AD204 is that
the AD202 is powered directly from a 15 V dc supply while the
AD204 is powered by an externally supplied clock, such as the
recommended AD246 Clock Driver.
The AD202 and AD204 provide total galvanic isolation between
the input and output stages of the isolation amplifier through
the use of internal transformer-coupling. The functionally com-
plete AD202 and AD204 eliminate the need for an external,
user-supplied dc/dc converter. This permits the designer to
minimize the necessary circuit overhead and consequently reduce
the overall design and component costs.
The design of the AD202 and AD204 emphasizes maximum
flexibility and ease of use, including the availability of an
uncommitted op amp on the input stage. They feature a bipolar
±5 V output range, an adjustable gain range of from 1 to 100 V/V,
± 0.025% max nonlinearity (K grade), 130 dB of CMR and the
AD204 consumes a low 35 mW of power.
PRODUCT HIGHLIGHTS
The AD202 and AD204 are full-featured isolators offering
numerous benefits to the user:
Small Size: The AD202 and AD204 are available in SIP and
DIP form packages. The SIP package is just 0.25" wide, giving
the user a channel density of four channels per inch. The isolation
barrier is positioned to maximize input to output spacing. For
applications requiring a low profile, the DIP package provides a
height of just 0.350".
High Accuracy: With a maximum nonlinearity of ± 0.025%
for the AD202K/AD204K (± 0.05% for the AD202J/AD204J)
and low drift over temperature, the AD202 and AD204 provide
high isolation without loss of signal integrity.
Low Power: Power consumption of 35 mW (AD204) and
75 mW (AD202) over the full signal range makes these isolators
ideal for use in applications with large channel counts or tight
power budgets.
Wide Bandwidth: The AD204’s full-power bandwidth of 5 kHz
makes it useful for wideband signals. It is also effective in appli-
cations like control loops, where limited bandwidth could result
in instability.
Excellent Common-Mode Performance: The AD202K/
AD204K provide ± 2000 V pk continuous common-mode isola-
tion, while the AD202J/AD204J provide ± 1000 V pk continuous
common-mode isolation. All models have a total common-mode
input capacitance of less than 5 pF inclusive of power isolation.
This results in CMR ranging from 130 dB at a gain of 100 dB to
104 dB (minimum at unity gain) and very low leakage current
(2 µA maximum).
Flexible Input: An uncommitted op amp is provided at the
input of all models. This provides buffering and gain as required,
and facilitates many alternative input functions including filtering,
summing, high-voltage ranges, and current (transimpedance) input.
Isolated Power: The AD204 can supply isolated power of
± 7.5 V at 2 mA. This is sufficient to operate a low-drift input
preamp, provide excitation to a semiconductor strain gage, or
to power any of a wide range of user-supplied ancillary circuits.
The AD202 can supply ± 7.5 V at 0.4 mA which is sufficient to
operate adjustment networks or low-power references and op
amps, or to provide an open-input alarm.
V
+V
–V
SIG
ISO
ISO
IN COM
OUT
OUT
IN–
IN+
FB
FUNCTIONAL BLOCK DIAGRAM
+7.5V
–7.5V
5V
FS
FILTER
RECT
AND
Low-Cost, Miniature
Isolation Amplifiers
MOD
25kHz
POWER
SIGNAL
AD202/AD204
25kHz
OSCILLATOR
DEMOD
AD202
FS
5V
HI
LO
15V DC
POWER
RETURN
V
OUT

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AD204 Summary of contents

Page 1

... SIP or DIP style package. The primary distinction between the AD202 and the AD204 is that the AD202 is powered directly from supply while the AD204 is powered by an externally supplied clock, such as the recommended AD246 Clock Driver. The AD202 and AD204 provide total galvanic isolation between the input and output stages of the isolation amplifier through the use of internal transformer-coupling ...

Page 2

... V) S TEMPERATURE RANGE Rated Performance Operating Storage 4 PACKAGE DIMENSIONS SIP Package (Y) DlP Package (N) NOTES Specifications same as AD204J. 1 Nonlinearity is specified deviation from a best straight line. 1.0 µF min decoupling required (see text). 2 (Typical @ 25 C and unless otherwise noted.) S AD204J AD204K 1 V/V–100 V/V ± ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD202/AD204 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... The primary distinction between the AD202 and AD204 is in the method by which they are powered: the AD202 operates directly from while the AD204 is powered by a non- isolated externally-supplied clock (AD246) which can drive AD204s. The main advantages of using the externally- clocked AD204 over the AD202 are reduced cost in multichannel applications, lower power consumption, and higher bandwidth ...

Page 5

... V supply. Alternatively, the circuit shown in Figure 4 (essentially an AD246) can be used. In either case, one clock circuit can operate at least 32 AD204s at the rated minimum supply voltage of 14.25 V and one additional isolator can be operated for each 40 mV increase in supply voltage ...

Page 6

... For these of F isolators, the significant resistance will normally be that the path from the source of the common-mode signal to IN COM. The AD202 and AD204 also perform well in applications requiring rejection of fast common-mode steps, as described in the Appli- cations section. 180 160 ...

Page 7

... Figure 12. The filter limits the bandwidth of the input (to about 5.3 kHz) so that the isolator does not see fast, out-of-band input terms that can cause small amounts (± 0.3%) of internal ringing. The AD204 will then settle to ± 0.1% in about 300 microseconds for step. 3.3k V ...

Page 8

... AD204s can be driven from a single AD246 (or equi- valent) clock driver when the isolated power outputs of the AD204s are loaded with less than 200 µA each worst-case supply voltage of 14 ...

Page 9

... In such cases, shielded cable may be required or AD204s can be used. APPLICATIONS EXAMPLES Low-Level Sensor Inputs. In applications where the output of low-level sensors such as thermocouples must be isolated, a low drift input amplifier can be used with an AD204, as shown 39k ...

Page 10

... Floating Current Source/Ohmmeter. When a small floating current is needed with a compliance range ± 1000 V dc, the AD204 can be used to both create and regulate the current. This can save considerable power, since the controlled current does not have to return to ground. In Figure 21, an AD589 reference is used to force a small fixed voltage across R ...

Page 11

... NOM AD202/AD204 AD202/AD204 DIP Package 2.100 (53.3) MAX 0.015 (0.38) 0.018 (0.46) SQUARE BOTTOM VIEW 1.60 (40.6) PIN 21 IS PRESENT ONLY ON AD204 AC1060 Mating Socket 2.600 (66) 2.350 (59.7) AD246JN Package 1.445 (36.7) MAX 0.35 (8.9) AD246JN MAX FRONT VIEW 0.020 (0.51) 0.020 (0.51) 0.015 (0.38) 0.010 (0.25) 0.145 (3.7) 1 ...

Page 12

... AD202/AD204–Revision History Location Data Sheet changed from REV REV. C. Change to SIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Page ...

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