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參數(shù)資料
| 型號(hào)： | MAX515 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5V, Low-Power, Voltage-Output, Serial 10-Bit DACs(單通道,電壓輸出,串行,10位D/A轉(zhuǎn)換器) |
| 中文描述： | 5V、低功耗、電壓輸出、串行10位DAC |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 175K |
| 代理商： | MAX515 |
Internal Reference (MAX 504 only)
The on-chip reference is laser trimmed to generate 2.048V
at REFOUT. The output stage can source and sink current
so REFOUT can settle to the correct voltage quickly in
response to code-dependent loading changes. Typically,
source current is 5mA and sink current is 100μA.
REFOUT connects the internal reference to the R-2R DAC
ladder at REFIN. The R-2R ladder draws 50μA maximum
load current. If any other connection is made to REFOUT,
ensure that the total load current is less than 100μA to
avoid gain errors.
For applications requiring very low-noise performance, con-
nect a 33μF capacitor from REFOUT to AGND. If noise is
not a concern, a lower value (3.3μF min) capacitor may be
used. To reduce noise further, insert a buffered RC filter
between REFOUT and REFIN (Figure 2). The reference
bypass capacitor C
REFOUT
is still required for reference sta-
bility. In applications not requiring the reference, connect
REFOUT to V
DD
(to save power and to eliminate the need
for C
REFOUT
) or use the MAX515 (no internal reference).
External Reference
An external reference in the range (V
SS
+ 2V) to (V
DD
- 2V)
may be used with the MAX504 in dual-supply operation.
With the MAX515 or the MAX504 in single-supply use, the
reference must be positive and may not exceed V
DD
- 2V.
The reference voltage determines the DAC’s full-scale out-
put. The DAC input resistance is code dependent and is
minimum (40k
) at code 0101... and virtually infinite at
code 0000.... REFIN’s input capacitance is also code
dependent and has a 50pF maximum value at several
codes.
If an upgrade to the internal reference is required, the 2.5V
MAX873A is suitable: ±15mV initial accuracy, TCV
OUT
=
7ppm/°C (max).
Logic Interface
The MAX504/MAX515 logic inputs are designed to be com-
patible with TTL or CMOS logic levels. However, to achieve
the lowest power dissipation, drive the digital inputs with rail-
to-rail CMOS logic. With TTL logic levels, the power require-
ment increases by a factor of approximately 2.
Serial Clock and Update Rate
Figure 1 shows the MAX504/MAX515 timing. The maxi-
mum serial clock rate is given by 1/(t
CH
+t
CL
), approxi-
mately 14MHz. The digital update rate is limited by the
chip-select period, which is 16 x (t
CH
+ t
CL
) + t
CSW
.
This equals a 1.14μs, or 877kHz, update rate. However,
the DAC settling time to 10 bits is 25μs, which may limit
the update rate to 40kHz for full-scale step transitions.
____________Applications Information
Refer to Figures 3a and 3b for typical operating con-
nections.
Serial Interface
The MAX504/MAX515 use a three-wire serial interface that
is compatible with SPI, QSPI (CPOL = CPHA = 0), and
Microwire standards as shown in Figures 4 and 5. The
DAC is programmed by writing two 8-bit words (see Figure
1 and the Functional Diagram. 16 bits of serial data are
clocked into the DAC in the following order: 4 fill (dummy)
bits, 10 data bits, and 2 sub-LSB 0s. The 4 dummy bits are
not normally needed, and are required
only
when DACs
are daisy chained. The 2 sub-LSB 0s, however, are
always
needed, and allow hardware and software compatibility
with the 12-bit MAX531/MAX538/MAX539. Transitions at
CS should occur while SCLK is low. Data is clocked in on
SCLK’s rising edge while CS is low. The serial input data is
held in a 16-bit serial shift register. On CS’s rising edge, the
10 data-bits are transferred to the DAC register and update
the DAC. With CS high, data cannot be clocked into the
MAX504/MAX514.
The MAX504/MAX515 inputs data in 16-bit blocks. The SPI
and Microwire interfaces output data in 8-bit blocks, there-
by requiring two write cycles to input data to the DAC. The
QSPI interface allows variable data input from 8 to 16 bits,
and can be loaded into the DAC in one write cycle.
M
5V, Low-Power, Voltage-Output,
S erial 10-Bit DACs
_______________________________________________________________________________________
9
300
50
1
10
100
100
M
FREQUENCY (kHz)
R
μ
V
R
)
150
200
250
0
0.1
1000
TOTAL
REFERENCE
NOISE
R
S
REFOUT
C
REFOUT
C
S
TEK 7A22
C
REFOUT
= 3.3
μ
F
C
REFOUT
= 47
μ
F
SINGLE POLE ROLLOFF
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
R
Figure 2. Reference Noise vs. Frequency
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
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