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參數(shù)資料
| 型號： | AD7937AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS 8+4 Loading Dual 12-Bit DAC |
| 中文描述： | DUAL, PARALLEL, 8 BITS INPUT LOADING, 0.6 us SETTLING TIME, 12-BIT DAC, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 157K |
| 代理商： | AD7937AR |
AD7937
–7–
REV. 0
APPLICATION HINTS
Output Offset:
CMOS D/A converters in circuits such as Fig-
ures 4 and 5 exhibit a code-dependent output resistance which
in turn can cause a code-dependent error voltage at the output
of the amplifier. The maximum amplitude of this error, which
adds to the D/A converter nonlinearity, depends on V
OS
, where
V
OS
is the amplifier input offset voltage. To maintain specified
operation, it is recommended that V
OS
be no greater than
(25 10
–
6
) (V
REF
) over the temperature range of operation.
Suitable op amps are the AD711C and its dual version, the
AD712C. These op amps have a wide bandwidth and high slew
rate and are recommended for wide bandwidth ac applications.
AD711/AD712 settling time to 0.01% is typically 3
μ
s.
Temperature Coefficients:
The gain temperature coefficient
of the AD7937 has a maximum value of 5 ppm/
°
C and typical
value of 1 ppm/
°
C. This corresponds to worst case gain shifts of
2 LSBs and 0.4 LSBs respectively over a 100
°
C temperature range.
When trim resistors R1 (R3) and R2 (R4) are used to adjust full
scale range as in Figure 4, the temperature coefficient of R1 (R3)
and R2 (R4) should also be taken into account.
High Frequency Considerations:
AD7937 output capacitance
works in conjunction with the amplifier feedback resistance to
add a pole to the open-loop response. This can cause ringing or
oscillation. Stability can be restored by adding a phase compen-
sation capacitor in parallel with the feedback resistor. This is
shown as C1 and C2 in Figures 4 and 5.
Feedthrough:
The dynamic performance of the AD7937 depends
upon the gain and phase stability of the output amplifier, together
with the optimum choice of PC board layout and decoupling
components.
MICROPROCESSOR INTERFACING
The byte loading structure of the AD7937 makes it very easy to
interface the device to any 8-bit microprocessor system. Figure
8 shows an example 8-bit interface between the AD7937 and a
generic 8-bit microcontroller/DSP processor. Pins D7 to D0 of
the processor are connected to pins D7 to D0 of the AD7937.
When writing to the DACs, the lower 8 bits must be written
first, followed by the upper four bits. The upper four bits should
be output on data lines D0 to D3.
*
ADDITIONAL PINS OMITTED FOR CLARITY
ADDRESS
DECODE
AD7937
*
D7
D0
CS
UPD
WR
D7
D0
R/
W
DATA
BUS
CONTROLLER/
DSP PROCESSOR
CLR
FROM
SYSTEM
RESET
A0
A0
A1
A1
UPPER BITS
OF ADDRESS
BUS
*
Figure 8. AD7937 8-Bit Interface
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