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參數資料
| 型號： | AD7302BNZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 2.7 V to 5.5 V, Parallel Input Dual Voltage Output 8-Bit DAC |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 1.2 us SETTLING TIME, 8-BIT DAC, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數： | 3/16頁 |
| 文件大?。?/td> | 292K |
| 代理商： | AD7302BNZ |
AD7302
–11–
REV. 0
VREF
is the voltage applied to the external REFIN pin when
the external reference is selected and is VDD/2 if the
internal reference is used.
Table I. Output Voltage for Selected Input Codes
Digital Input
MSB . . . LSB
Analog Output
1111 1111
2
× 255/256 × V
REF V
1111 1110
2
× 254/256 × V
REF V
1000 0001
2
× 129/256 × V
REF V
1000 0000
VREF V
0111 1111
2
× 127/256 × V
REF V
0000 0001
2
× V
REF/256 V
0000 0000
0 V
00
01
DAC INPUT
CODE
FF
80
81
FE
7F
0
2.VREF
VREF
DAC
OUTPUT
VOLTAGE
Figure 26. DAC Transfer Function
Figure 27 shows a typical setup for the AD7302 when using its
internal reference. The internal reference is selected by tying the
REFIN pin to VDD. Internally in the reference section there is a
reference detect circuit that will select the internal VDD/2 based
on the voltage connected to the REFIN pin. If REFIN is within
a threshold voltage of a PMOS device (approximately 1 V) of
VDD the internal reference is selected. When the REFIN voltage
is more than 1 V below VDD, the externally applied voltage at
this pin is used as the reference for the DAC. The internal
reference on the AD7302 is VDD/2, the output current to voltage
converter within the AD7302 provides a gain of two. Thus the
output range of the DAC is from 0 V to VDD, based on Table I.
AD7302
VOUTA
VOUTB
10F
0.1F
VDD = 3 TO 5V
VDD
A/B
REF IN
CLR
PD
VDD
AGND DGND
CS
WR LDAC
D7–D0
VOUTA
VOUTB
DATA BUS
CONTROL INPUTS
Figure 27. Typical Configuration Selecting the Internal
Reference
Figure 28 shows a typical setup for the AD7302 when using an
external reference. The reference range for the AD7302 is from
1 V to VDD/2 V. Higher values of reference can be incorporated,
but will saturate the output at both the top and bottom end of
the transfer function. There is a gain of two from input to output
on the AD7302. Suitable references for 5 V operation are the
AD780 and REF192. For 3 V operation a suitable external
reference would be the AD589 a 1.23 V bandgap reference.
AD7302
VOUTA
VOUTB
10F
0.1F
VDD = 3 TO 5V
VDD
AD780/REF192
WITH VDD = 5V
OR
AD589 WITH VDD = 3V
REF IN
GND
VOUT
VIN
0.1F
EXT REF
VDD
AGND DGND
D7–D0
VOUTA
VOUTB
DATA BUS
CONTROL INPUTS
A/B
CLR
PD
CS
WR LDAC
Figure 28. Typical Configuration Using An External
Reference
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