AS1526, AS1527
1 0 - B i t , S i n g l e S u p p l y, L o w - P o w e r, 7 3 k s ps
A/ D Converters
D a ta S he e t
1 General Description
The AS1526/AS1527 are low-power, 10-bit, 73ksps ana-
log-to-digital (A/D) converters specifically designed for
single-supply A/D applications. Superior AC characteris-
tics, very low power consumption, and robust packaging
make these ultra-small devices perfect for battery-pow-
ered analog-data collection devices.
The integrated successive-approximation register (SAR)
and a fast (1.5µs) sampling track/hold time provide an
economic and highly-reliable A/D conversion solution.
The AS1526/AS1527 operate from a single 2.7 to 3.6V
supply. The AS1527 requires an external reference,
using less power than the AS1526, however, the
AS1526 features an internal 2.5V reference.
As with the AS1527, the AS1526 can also be used with
an external reference, which uses the input range 0V to
V
REF
, including the positive supply range.
The AS1527 consumes only 3mW (V
DD
= 3V) at the
73ksps maximum sampling speed. Both devices feature
a low-current (0.3µA) shutdown mode, which reduces
power consumption at slower throughput rates.
Data accesses are made via the standard, high-speed
3-wire serial interface, which is SPI-, QSPI-, and
Microwire-compatible. Both devices contain an internal
clock, however, both devices also support an external
clock for increased flexibility.
The AS1526/AS1527 are available in an 8-pin SOIC-150
package.
2 Key Features
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10-Bit Resolution with 7.5µs Conversion Time
Sampling Rate: 73ksps
Straight Binary (Unipolar) Data Format
Single-Supply Operation:+2.7 to +3.6V
Internal 2.5V Reference (AS1526)
Low Power-Consumption:
- 4mW (73ksps, AS1526)
- 3mW (73ksps, AS1527)
- 66µW (1ksps, AS1527)
- 1µW (Shutdown Mode)
Integrated Track/Hold Amplifier
Internal Clock
SPI/QSPI/Microwire 3-Wire Serial Interface
Operating Temperature Range: -40 to +85ºC
8-pin SOIC-150 Package
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3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion, data logging devices, lab instruments, or for any
other space-limited A/D devices with low power con-
sumption and single-supply requirements.
Figure 1. Block Diagram and Pin Assignments
1
V
DD
7
CSN
8
SCLK
3
SHDNN
Control
Logic
Internal
Clock
SHDNN 3
2
AIN
4
REF
Track/
Hold
10-Bit
SAR
2.5V
Ref
5
GND
AS1526
only
Output
Shift
Register
6
DOUT
AIN 2
7 CSN
AS1526/AS1527
V
DD
1
8 SCLK
AS1526/
AS1527
6 DOUT
REF 4
5 GND
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Revision 1.03
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AS1526/AS1527
Data Sheet
Contents
1 General Description
2 Key Features
3 Applications
..............................................................................................................................1
.........................................................................................................................................1
...........................................................................................................................................1
...........................................................................................................................3
...................................................................................................................................................3
....................................................................................................................................................3
4 Pinout and Packaging
Pin Assignments
Pin Descriptions
5 Absolute Maximum Ratings
6 Electrical Characteristics
Timing Characteristics
..................................................................................................................4
.......................................................................................................................5
.........................................................................................................8
..........................................................................................................................................7
7 Typical Operating Characteristics
8 Detailed Description
Analog Input
Track/Hold
............................................................................................................................
11
........................................................................................................................................................11
...........................................................................................................................................................12
.....................................................................................................................................................12
..............................................................................................................................................12
................................................................................................................................................14
....................................................................................................................................14
......................................................................................................................15
Input Protection ..............................................................................................................................................12
External Clock
Timing and Control
Transfer Function
Reducing Supply Current
External Reference
Initialization
Internal 2.5V Reference (AS1526)
.............................................................................................................................................15
9 Application Information
Serial Interface
.......................................................................................................................16
.........................................................................................................................................................16
....................................................................................................................................................16
Serial Interface Configuration .........................................................................................................................16
SPI and Microwire Interfaces .........................................................................................................................16
QSPI 17
Layout Considerations
........................................................................................................................................18
.......................................................................................................................19
Package Drawings and Markings
10 Ordering Information
........................................................................................................................20
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Revision 1.03
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AS1526/AS1527
Data Sheet
- P i n o u t
and Packaging
4 Pinout and Packaging
Pin Assignments
Figure 2. Pin Assignments (Top View)
V
DD
1
8 SCLK
AIN 2
7 CSN
AS1526/
AS1527
SHDNN 3
6 DOUT
REF 4
5 GND
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
Pin Name
V
DD
AIN
Description
Positive Supply Voltage.
+2.7 to +3.6V
Sampling Analog Input.
0V to V
REF
range.
Three-Level Shutdown Input.
Pulling this pin low puts the AS1526/AS1527
in shutdown mode, down to 4µA (max) supply current. The devices are fully
operational with this pin high or floating.
Note:
For the AS1526, pulling this pin high enables the internal reference; let-
ting this pin float disables the internal reference allowing for the use of an
external reference. See also pin 4.
A/D Conversion Reference Voltage.
This pin serves as the internal 2.5V
reference output for the AS1526; bypass this pin with a 4.7µF capacitor.
This pin also serves as the external reference voltage input for the AS1527, or
for AS1526 if the internal reference is disabled. Bypass this pin with a
minimum of 0.1µF when using an external reference. See also pin 3.
Analog and Digital Ground
Serial Data Output.
Data changes state at SCLK’s falling edge.
Note:
This pin is high-impedance when pin CSN is high.
Active-Low Chip Select.
The falling edge of this pin initiates a conversion.
Note:
When this pin is high, DOUT is high-impedance.
Serial Clock Input.
This pin clocks data out at rates up to 2.1MHz.
3
SHDNN
4
REF
5
6
7
8
GND
DOUT
CSN
SCLK
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AS1526/AS1527
Data Sheet
- A b s o l u t e
Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in
Section 6 Electrical
Characteristics on page 5
is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
V
DD
to GND
AIN to GND
REF to GND
Digital Inputs to GND
DOUT to GND
DOUT Current
Continuous Power Dissipation
(T
AMB
= +70ºC)
Operating Temperature Range
Storage Temperature Range
-40
-60
Min
0.3
-0.3
-0.3
-0.3
-0.3
-25
Max
+5
V
DD
+
0.3V
V
DD
+
0.3V
V
DD
+
0.3V
V
DD
+
0.3V
+25
471
+85
+150
Units
V
V
V
V
V
mA
mW
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “Moisture/Reflow
Sensitivity Classification for non-hermetic
Solid State Surface Mount Devices”.
Derate 5.88mW/ºC above +70ºC
Comments
Package-Body Peak Temperature
260
°C
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Revision 1.03
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AS1526/AS1527
Data Sheet
- E l e c t r i c a l
Characteristics
6 Electrical Characteristics
V
DD
= +2.7 to +3.6V, 73ksps, f
SCLK
= 2.1MHz (50% duty cycle); AS1526:4.7µF capacitor at REF, AS1527: external ref-
erence; V
REF
= 2.5V applied to REF; T
AMB
= T
MIN
to T
MAX
(unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
DC Accuracy
1
Parameter
Conditions
Min
Typ
Max
Units
Resolution
Relative Accuracy
DNL
2
10
±0.5
No missing codes over temperature
±1
±2
±2
±1
Bits
LSB
LSB
LSB
LSB
ppm/°C
Differential Non-Linearity
Offset Error
Gain Error
3
Gain Temperature Coefficient
Dynamic Specifications
(10kHz sine-wave input, 0V to 2.5Vp-p, 73ksps, f
SCLK
=2.1MHz)
SINAD
THD
SFDR
Signal-to-Noise + Distortion
Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Small-Signal Bandwidth
Full-Power Bandwidth
Conversion Rate
t
CONV
t
ACQ
Conversion Time
Track/Hold Acquisition Time
Throughput Rate
t
AP
Aperture Delay
Aperture Jitter
Analog Input
Input Voltage Range
Input Capacitance
Internal Reference
(AS1526 only)
REF
Output Voltage
REF
Short-Circuit Current
REF
Temperature Coefficient
Load Regulation
C
REFBYP
6
4
61
Up to the 5th harmonic
-70
70
-3dB rolloff
2.5
2.5
dB
dB
dB
MHz
MHz
5.5
7.5
1.5
µs
µs
ksps
ns
ps
f
SCLK
= 2.1MHz
Figure 27 on page 13
7
<50
73
0
21
V
REF
V
pF
T
AMB
= +25ºC
5
2.47
2.50
2.53
45
V
mA
ppm/°C
mV
µF
AS1526
0 to 0.2mA output load
4.7
±30
0.35
Capacitive Bypass at
REF
External Reference
(V
REF
= 2.5V)
Input Voltage Range
Input Current
Input Resistance
REF
Input Current in Shutdown
C
REFBYP
Capacitive Bypass at
REF
SHDNN = 0V
0.1
18
1.00
100
25
±0.01
10
V
DD
+
50mV
150
V
µA
kΩ
µA
µF
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