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參數(shù)資料
| 型號： | SPT5400 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 13-BIT, OCTAL VOLTAGE-OUTPUT DAC WITH PARALLEL INTERFACE |
| 中文描述： | 13位，八電壓輸出帶有并行接口的數(shù)模轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 73K |
| 代理商： | SPT5400 |
5
5/15/00
SPT5400
POWER SUPPLY SEQUENCING
The required power-up sequence is as follows: V
SS
(or
V
DD
) first, V
DD
(or V
SS
) second, and then REF_. The
sequence in which V
DD
and V
SS
come up is not critical.
However, REF_ must come up after V
DD
and V
SS
are
established.
Fairchild strongly recommends that the digital input pins
be driven only after V
DD
and V
SS
are established. Driving
a digital input prior to establishing supplies will violate a
condition outlined in the Input Voltages section (see the
Absolute Maximum Ratings on page 2 of this data sheet)
and cause damage to the part. If either REF_ or the digi-
tal inputs must come up before V
DD
and V
SS
, due to sys-
tem constraints, limit the current to the REF_ or digital
input pins to less than 1 mA.
This recommended power-up sequence must be
executed in reversed order for power-down. It should be
noted that none of the Absolute Maximum Rating condi-
tions are violated during power-up and power-down.
ANALOG OUTPUTS
The voltage outputs to the SPT5400 are buffered inter-
nally by precision amplifiers with a 2.4 V/
μ
s typical slew
rate. The typical settling time to
±
1/2 LSB, with a full-
scale transition at the outputs, is 7
μ
s. Each DAC output
is protected against a short to GND or AGNDxx. The typi-
cal short-circuit currents are 25 mA when the DAC is
at positive full scale, and 2.5 mA when the DAC is at
negative full scale.
BIPOLAR OUTPUT VOLTAGE RANGE
(AGNDxx = 0 V)
For symmetrical bipolar operation, AGNDxx should be
tied to the system ground. The relationship between the
output voltage and the digital code is shown in table IV.
The output voltage of the DAC ladder (VDAC) is multi-
plied by 2 and level-shifted by the reference voltage. The
output voltage of the amplifier is given by the following
equation:
V
OUT
= 2(VDAC) – REFxx
Where VDAC is the voltage at the noninverting input of
the amplifier and REFxx is the voltage at the reference
input of the DAC.
With AGNDxx connected to the system ground, the out-
put voltage of the DAC ladder is:
VDAC = (D/2
13)
REFxx
Where D is the numeric value of the DAC’s binary input
code.
Replacing VDAC in the equation gives the output
voltage.
V
OUT
xx=2
D
2
REFxx
(
REFxx
REFxx
D
2
REFxx
D
4096
13
12
)
=
1
1
1 LSB = REFxx
1
4096
D ranges from 0 to 8191 (2
13
–1).
Table IV – Input Code/Output Tables
Bipolar (AGNDxx = 0 V)
Input
1 1111 1111 1111
1 0000 0000 0001
1 0000 0000 0000
0 1111 1111 1111
0 0000 0000 0001
0 0000 0000 0000
Output
+REFxx (4095/4096)
+REFxx (1/4096)
0 V
–REFxx (1/4096)
–REFxx (4095/4096)
–REFxx
Positive Unipolar (AGNDxx = REFxx/2)
Input
1 1111 1111 1111
1 0000 0000 0000
0 0000 0000 0000
Output
+REFxx (8191/8192)
+REFxx/2
0 V
POSITIVE UNIPOLAR OUTPUT VOLTAGE RANGE
(AGNDxx = REFxx/2)
For positive unipolar operation, AGNDxx should be set to
REFxx/2. The relationship between the output voltage
and the digital code is shown in table IV. For example, if a
4.096 V reference is used, AGNDxx should be offset by
2.048 V. This results in a unipolar output voltage of 0 to
4.0955 V, where 1 LSB = 500
μ
V. the maximum current
out of any AGNDxx pin is:
I
REFxx
AGNDxx
5 k
AGNDXX
=
CUSTOM OUTPUT VOLTAGE RANGE
If the voltage at the REFxx input is higher than the volt-
age at the AGNDxx input, the AGNDxx inputs can be off-
set by any voltage within the supply rails. One way to
achieve this is to add positive offset to AGNDxx by select-
ing the reference voltage and the voltage at AGNDxx
such that the resulting output voltages do not come within
±
0.5 V of the supply rails. Another way is to digitally offset
AGNDxx by connecting one DAC output to one or more
AGNDxx inputs. Note that a DAC output should not be
connected to its own AGNDxx input.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT5400SCP | 功能描述:數(shù)模轉(zhuǎn)換器- DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| SPT5420 | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:13-BIT, OCTAL D/A CONVERTER |
| SPT5420SIM | 功能描述:數(shù)模轉(zhuǎn)換器- DAC D/a Converter 13Bit Octal RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| SPT5502 | 制造商:SSDI 制造商全稱:Solid States Devices, Inc 功能描述:1 AMP HIGH VOLTAGE / HIGH SPEED NPN TRANSISTOR |
| SPT5502_1 | 制造商:SSDI 制造商全稱:Solid States Devices, Inc 功能描述:HIGH VOLTAGE / HIGH SPEED NPN TRANSISTOR |
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