AS1529-BTDR austriamicrosystems, AS1529-BTDR Datasheet - Page 11

• Manufacturer Part Number: AS1529-BTDR
• Description: IC A/D 10-BIT 2-CH 150K 8-TDFN
• Manufacturer: austriamicrosystems

Specifications of AS1529-BTDR

• Number Of Bits: 10
• Sampling Rate (per Second): 150k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS1528/AS1529
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 18. Single Conversion – AIN1 vs. GND (AS1529), Unipolar Mode AIN+ vs. AIN- (AS1528)
If AIN2 is selected
then high again. This powers up the AS1529 and places the track/hold circuitry in track mode with AIN2 connected to
the positive input capacitor. Next hold CNVST high for
track/hold circuitry in hold mode. The AS1529 then performs a conversion and shuts down automatically. The MSB is
available at DOUT after 3.7µs. Data can then be clocked out using SCLK.
Note: If all 12 bits of data are not clocked out before CNVST is driven high, AIN2 is selected for the next conversion.
Selecting Unipolar or Bipolar Conversions (AS1528)
True-differential conversion (with the AS1528 unipolar and bipolar modes) is selected using pin CNVST
AIN+ and AIN- are sampled at the falling edge of CNVST. In unipolar mode, AIN+ can exceed AIN- by up to VREF. The
output format is straight binary. In bipolar mode, either input can exceed the other by up to V
two’s complement. In both modes, the input common mode range can go from GND to V
Figure 19. Single Conversion – AIN2 vs. GND (AS1529), Bipolar Mode AIN+ vs. AIN- (AS1528)
Note: In unipolar and bipolar modes, AIN+ and AIN- must not exceed V
If unipolar mode is selected
cuitry in track mode with AIN+ and AIN- connected to the input capacitors. Hold CNVST high for
the signal. Drive CNVST low to place the track/hold circuitry in hold mode. The AS1528 then performs a conversion
and shutdown automatically. The MSB is available at DOUT after 3.7µs. Data can then be clocked out using SCLK.
Clock out all 12 bits of data before driving CNVST high for the next conversion. If all 12 bits of data are not clocked out
before CNVST is driven high, bipolar mode is selected for the next conversion.
If bipolar mode is selected
30ns and then high again. This places the track/hold circuitry in track mode with AIN+ and AIN- connected to the input
capacitors.
Next hold CNVST high for
mode. The AS1528 then performs a conversion and shuts down automatically. The MSB is available at DOUT after
3.7µs. Data can then be clocked out using SCLK.
Note: If all 12 bits of data are not clocked out before CNVST is driven high, bipolar mode is selected for the next con-
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CNVST
CNVST
DOUT
DOUT
SCLK
SCLK
by more than 50mV.
version.
t
ACQ
High Z
High Z
t
ACQ
(see Figure
t
CONV
t
CONV
tACQ
(see Figure
(see Figure
19), drive CNVST high for at least 30ns. Next, drive CNVST low for at least 30ns, and
MSB
MSB
to fully acquire the signal. Drive CNVST low to place the track/hold circuitry in hold
B9
B9
1
1
B8
B8
19), drive CNVST high for at least 30ns. Next, drive CNVST low for at least
18), drive CNVST high to power up the AS1528 and place the track/hold cir-
Sampling Instant
B7
B7
Sampling Instant
B6
B6
4
4
Revision 1.02
tACQ
B5
B5
to fully acquire the signal. Drive CNVST low to place the
B4
B4
B3
B3
DD
B2
B2
by more than 50mV or be lower than GND
8
8
B1
B1
LSB
LSB
B0
B0
DD
ZERO ZERO
ZERO ZERO
REF/2
.
. The output format is
tACQ
12
12
to fully acquire
(see page
High Z
High Z
11 - 21
3).