DAC8534 Datasheet, PDF (17/20 Pages) Texas Instruments – Quad Channel, Low Power, 16-Bit, Serial Input DIGITAL-TO-ANALOG CONVERTER

scale change on the neighboring channel is typically less than
0.5LSBs. The AC crosstalk measured (for a full-scale, 1kHz
sine wave output generated at one channel, and measured at
the remaining output channel) is typically under –100dB.
In addition, the DAC8534 can achieve typical AC perfor-
mance of 96dB SNR (Signal-to-Noise Ratio) and 65dB THD
(Total Harmonic Distortion), making the DAC8534 a solid
choice for applications requiring high SNR at output frequen-
cies at or below 4kHz.
OUTPUT VOLTAGE STABILITY
The DAC8534 exhibits excellent temperature stability of
5ppm/°C typical output voltage drift over the specified tem-
perature range of the device. This enables the output voltage
of each channel to stay within a ±25µV window for a ±1°C
ambient temperature change.
Good Power-Supply Rejection Ratio (PSRR) performance
reduces supply noise present on AV_DD from appearing at the
outputs to well below 10µV-s. Combined with good DC noise
performance and true 16-bit differential linearity, the DAC8534
becomes a perfect choice for closed-loop control applica-
tions.
SETTLING TIME AND OUTPUT
GLITCH PERFORMANCE
Settling time to within the 16-bit accurate range of the
DAC8534 is achievable within 10µs for a full-scale code
change at the input. Worst-case settling times between
consecutive code changes is typically less than 2µs, en-
abling update rates up to 500ksps for digital input signals
changing code-to-code. The high-speed serial interface of
the DAC8534 is designed in order to support these high
update rates.
For full-scale output swings, the output stage of each
DAC8534 channel typically exhibits less than 100mV of
overshoot and undershoot when driving a 200pF capacitive
load. Code-to-code change glitches are extremely low given
that the code-to-code transition does not cross an Nx4096
code boundary. Due to internal segmentation of the
DAC8534, code-to-code glitches occur at each crossing of
an Nx4096 code boundary. These glitches can approach
100nVs for N = 15, but settle out within ~2µs.
USING THE REF02 AS A POWER SUPPLY FOR
THE DAC8534
Due to the extremely low supply current required by the
DAC8534, a possible configuration is to use a REF02 +5V
precision voltage reference to supply the required voltage to
the DAC8534's supply input as well as the reference input, as
shown in Figure 10. This is especially useful if the power
supply is quite noisy or if the system supply voltages are at
some value other than 5V. The REF02 will output a steady
supply voltage for the DAC8534. If the REF02 is used, the
current it needs to supply to the DAC8534 is 1.085mA typical
and 1.78mA max for AV_DD = 5V. When a DAC output is
loaded, the REF02 also needs to supply the current to the
load. The total typical current required (with a 5kΩ load on a
given DAC output) is:
1.085mA + (5V/ 5kΩ) = 2.085mA
+15
+5V
REF02
3-Wire
Serial
Interface
SYNC
SCLK
D_IN
AI_DD + I_REF
AV_DD, V_REF
DAC8534
V_OUT = 0V to 5V
FIGURE 10. REF02 as a Power Supply to the DAC8534.
BIPOLAR OPERATION USING THE DAC8534
The DAC8534 has been designed for single-supply opera-
tion, but a bipolar output range is also possible using the
circuit in Figure 11. The circuit shown will give an output
voltage range of ±V_REF. Rail-to-rail operation at the amplifier
output is achievable using an amplifier such as the OPA703,
as shown in Figure 11.
+5V
R₁
10kΩ
10µF
0.1µF
DAC8534
AV_DD, V_REF
V_OUTX
R₂
10kΩ
+5V
OPA703
±5V
-5V
(Other pins omitted for clarity.)
FIGURE 11. Bipolar Operation with the DAC8534.
DAC8534
17
SBAS254D
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