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| 型號： | ADA4932-2YCPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF DUAL LP 80MA 24LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 2800 V/µs |
| -3db帶寬： | 560MHz |
| 電流 - 輸入偏壓： | 2.5µA |
| 電壓 - 輸入偏移： | 500µV |
| 電流 - 電源： | 9.6mA |
| 電流 - 輸出 / 通道： | 80mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 11 V，±1.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 24-LFCSP-VQ（4x4） |
| 包裝： | 帶卷 (TR) |
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Data Sheet
ADA4932-1/ADA4932-2
4. The feedback resistor value is modified as a final gain
adjustment to obtain the desired output voltage.
To make the output voltage VOUT = 1 V p-p, calculate RF
using the following formula:
(
)(
) (
)(
)
=
=
+
=
509
03
.
1
5
.
524
1
,
p
V
p
V
R
V
Desired
R
TH
TS
G
dm
OUT
F
The closest standard 1% value to 509 is 511 , which
gives a differential output voltage of 1.00 V p-p.
The final circuit is shown in Figure 63.
ADA4932-x
RL
VOUT, dm
1.00V p-p
+VS
–VS
RS
50
RG
499
RG
499
RF
511
RF
511
VOCM
VS
2V p-p
1V p-p
RT
53.6
RTS
25.5
07752-
054
Figure 63. Terminated Single-Ended-to-Differential System with G = 2
INPUT COMMON-MODE VOLTAGE RANGE
The ADA4932-x input common-mode range is shifted down
by approximately one VBE, in contrast to other ADC drivers
with centered input ranges such as the ADA4939-x. The
downward-shifted input common-mode range is especially
suited to dc-coupled, single-ended-to-differential, and single-
supply applications.
For ±5 V operation, the input common-mode range at the
summing nodes of the amplifier is specified as 4.8 V to +3.2 V,
and is specified as +0.2 V to +3.2 V with a +5 V supply. To
avoid nonlinearities, the voltage swing at the +IN and IN
terminals must be confined to these ranges.
INPUT AND OUTPUT CAPACITIVE AC COUPLING
While the ADA4932-x is best suited to dc-coupled applications,
it is nonetheless possible to use it in ac-coupled circuits. Input
ac coupling capacitors can be inserted between the source and
RG. This ac coupling blocks the flow of the dc common-mode
feedback current and causes the ADA4932-x dc input common-
mode voltage to equal the dc output common-mode voltage.
These ac coupling capacitors must be placed in both loops to keep
the feedback factors matched. Output ac coupling capacitors can
be placed in series between each output and its respective load.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
tage divider comprised of two 50 k resistors across the supplies,
with a tap at a voltage approximately equal to the midsupply
point, [(+VS) + (VS)]/2. Because of this internal divider, the
VOCM pin sources and sinks current, depending on the externally
applied voltage and its associated source resistance. Relying on
the internal bias results in an output common-mode voltage
that is within about 100 mV of the expected value.
In cases where more accurate control of the output common-
mode level is required, it is recommended that an external
source or resistor divider be used with source resistance less
than 100 . If an external voltage divider consisting of equal
resistor values is used to set VOCM to midsupply with greater
accuracy than produced internally, higher values can be used
because the external resistors are placed in parallel with the
internal resistors. The output common-mode offset listed in the
low impedance voltage source.
It is also possible to connect the VOCM input to a common-mode
level (CML) output of an ADC; however, care must be taken to
ensure that the output has sufficient drive capability. The input
impedance of the VOCM pin is approximately 10 k. If multiple
ADA4932-x devices share one ADC reference output, a buffer
may be necessary to drive the parallel inputs.
Rev. C | Page 23 of 28
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