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參數(shù)資料
| 型號： | AD9736BBC |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 14/12/10-Bit, 1200 MSPS D/A Converters |
| 中文描述： | SERIAL INPUT LOADING, 14-BIT DAC, BGA160 |
| 封裝： | MO-205AE, CSPBGA-160 |
| 文件頁數(shù)： | 29/42頁 |
| 文件大?。?/td> | 934K |
| 代理商： | AD9736BBC |
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Preliminary Technical Data
AD9736/AD9735/AD9734
VOLTAGE REFERENCE
Rev. PrJ | Page 29 of 42
The AD9736 output current is set by a combination of digital
control bits and the I120 reference current as shown in Figure 33.
Figure 33. Voltage Reference Circuit
The reference current is obtained by forcing the bandgap voltage
across an external 10kohm resistor from I120 (pin B14) to ground.
The 1.2V nominal bandgap voltage (Vref) will generate a 120uA
reference current in the 10k resistor. This current is adjusted
digitally by FSC<9:0> (REG02, REG03) to set the output full scale
current I
FS
:
>
<
×
+
×
=
0
:
9
1024
192
2
7
R
Vref
FSC
I
FS
The full scale output current range is 10mA to 30mA for register
values from 0x000 to 0x3FF. The default value of 0x200 generates
20mA full scale. The typical range is shown in
Figure 34
.
0
5
10
15
20
25
30
35
0
200
400
600
800
1000
DAC gain code
I
F
Figure 34. I
FS
vs. DAC Gain Code
VREF (pin C14) must be bypassed to ground with a 1nF capacitor.
The bandgap voltage is present on this pin and may be buffered for
use in external circuitry. The typical output impedance is near
5kohms. If desired, an external reference may be used to overdrive
the internal reference by connecting it to the VREF pin.
IPTAT (pin D14) is used for factory testing. It may be left floating
(preferred) or tied to analog ground. It will output a current which
is proportional to absolute temperature. The nominal output is
approximately 10uA at 25C. The slope is approximately 20nA per
degree C.
Current
Scaling
DAC
Vbg
1.2V
FSC<9:0>
Ifull-scale
AD9736
1nF
Vref
I120
10k
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| AD9736BBCZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-/12-/14-Bit, 1200 MSPS DACS |
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