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參數(shù)資料
| 型號： | AD9712B |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | RES,0.0,0.25W,METAL FILM,0% |
| 中文描述： | 12位，100 MSPS的D / A轉(zhuǎn)換 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 329K |
| 代理商： | AD9712B |
AD9712B/AD9713B
REV. B
–6–
T he REFERENCE IN pin can also be driven directly for wider
bandwidth multiplying operation. T he analog signal for this
mode of operation must have a signal swing in the range of
–3.75 V to –4.25 V. T his can be implemented by capacitively
coupling into REFERENCE IN a signal with a dc bias of –3.75 V
to –4.25 V, as shown in Figure 3; or by driving REFERENCE
IN with a low impedance op amp whose signal swing is limited
to the stated range.
Outputs
As indicated earlier, D
1
–D
4
(four MSBs) are decoded and drive
15 discrete current sinks. D5 and D6 are binarily weighted; and
D
7
–D
12
are applied to the R-2R network. T his segmented archi-
tecture reduces frequency domain errors due to glitch impulse.
REFERENCE
IN
AD9712B
AD9713B
–V
S
–
~
–4V
–V
S
17
Figure 3. Wideband Multiplying Circuit
T he Switch Network provides complementary current outputs
I
OUT
and I
OUT
. T hese current outputs are based on statistical
current source matching which provides 12-bit linearity without
trim. Current is steered to either I
OUT
or I
OUT
in proportion to
the digital input code. T he sum of the two currents is always
equal to the full-scale output current minus one LSB.
T he current output can be converted to a voltage by resistive
loading as shown in Figure 4. Both I
OUT
and I
OUT
should be
loaded equally for best overall performance. T he voltage which
is developed is the product of the output current and the value
of the load resistor.
Full-scale output current is determined by CONT ROL AMP
IN and R
SET
according to the equation:
I
OUT
(
FS) =
(
CONTROL AMP IN/R
SET
)
×
128
T he internal reference is nominally –1.18 V with a tolerance of
±
3.5% and typical drift over temperature of 50 ppm/
°
C. If
greater accuracy or better temperature stability is required, an
external reference can be utilized. T he AD589 reference shown
in Figure 1 features
±
10 ppm/
°
C drift over temperatures from
0
°
C to +70
°
C.
CONTROL
AMP IN
AD9712B
AD9713B
AD589
+
–
R
1
~11k
–V
S
19
Figure 1. Use of AD589 as External Reference
T wo modes of multiplying operation are possible with the
AD9712B/AD9713B. Signals with small signal bandwidths up
to 300 kHz and input swings of 100 mV, or dc signals from
–0.6 V to –1.2 V can be applied to the CONT ROL AMP input
as shown in Figure 2. Because the control amplifier is internally
compensated, the 0.1
μ
F capacitor at Pin 17 can be reduced to
0.01
μ
F to maximize the multiplying bandwidth. However, it
should be noted that settling time for changes to the digital in-
puts will be degraded.
CONTROL
AMP IN
AD9712B
AD9713B
19
24
17
18
18
REFERENCE
IN
CONTROL
AMP OUT
R
SET
R
SET
R
T
–0.6V TO –1.2V
300 kHz MAX
Figure 2. Low Frequency Multiplying Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9712BAN | RES,0.0,0.25W,METAL FILM,0% |
| AD9712BAP | TEST POINT, WHITE, 0.040 HOLE, 0.062 PCB |
| AD9712BBN | POWER JACK, 250V,2 COND. FEMALE,2.1MM |
| AD9712BBP | 12-Bit, 100 MSPS D/A Converters |
| AD9713BAN | 12-Bit, 100 MSPS D/A Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9712BAN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9712BAP | 制造商:Rochester Electronics LLC 功能描述:12BIT ECL 100MSPC DAC IC - Bulk |
| AD9712BBN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9712BBP | 制造商:Rochester Electronics LLC 功能描述:12BIT ECL 100MSPS DAC IC - Bulk |
| AD9712BSE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:12-Bit Digital-to-Analog Converter |
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