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PDF AS1542 Data sheet ( Hoja de datos )
| Número de pieza | AS1542 | |
| Descripción | 12-Bit ADC | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1542
16-Channel, 1 Msps, 12-Bit ADC with Sequencer
Data Sheet
1 General Description
The AS1542 is a 12-bit high-speed, low-power, 16-chan-
nel, successive-approximation ADC that operates from
a single 2.7 to 5.25V supply. The device features high
throughput rates (1Msps) and a low-noise, wide-band-
width track-and-hold amplifier that can handle input fre-
quencies in excess of 1 MHz.
The AS1542 features 16 single-ended or 8 fully differen-
tial analog inputs with a channel sequencer to allow a
programmed selection of channels to be converted
sequentially. The conversion time is determined by the
SCLK frequency (also used as the master clock to con-
trol the conversion).
The conversion process and data acquisition are con-
trolled using a chip select pin and a serial clock signal,
allowing the device to easily interface with microproces-
sors or DSPs. The input signal is sampled on the falling
edge of CSN and conversion is also initiated at this
point. There are no pipeline delays associated with the
device.
The AS1542 uses advanced design techniques to
achieve very low power dissipation at high throughput
rates. At maximum throughput rates, the AS1542 con-
sumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).
By using internal control register, single-ended or fully-
differential conversion mode with different input ranges
can be used with either straight binary or twos comple-
ment output coding.
The device is available in a TSSOP-28 pin package.
Figure 1. Typical Application
2 Key Features
! Single Supply Operation with VDRIVE Function:
2.7 to 5.25V
! Fast Throughput Rate: 1 Msps
! Sequencer & Channel Counter
! Software-Configurable Analog Input Types:
- 16-Channel Single-Ended
- 8-Channel Fully-Differential
! Software-Configurable Input Range
! Low Power Consumption at Max Throughput Rates:
- 10.1mW @ 1Msps (3.6V Supply)
- 18.4mW @ 1Msps (5.25V Supply)
! Shutdown Mode Current: 0.5µA
! Flexible Power/Serial Clock Speed Management
! Wide Input Bandwidth: 71dB SNR @ 50 kHz Input
Frequency
! No Pipeline Delays
! High Speed SPI/QSPI/Microwire/DSP Interface
! TSSOP-28 Package
3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
VDD
REFIN
VIN0:15
16
Multiplexer
Track/
Hold
AGND
GND
Sequencer
AS1542
12-Bit
ADC
Control
Logic
DGND
SCLK
DOUT
DIN
CSN
VDRIVE
www.austriamicrosystems.com
Revision 1.00
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1 page  
AS1542
Data Sheet - Electrical Characteristics
6 Electrical Characteristics
VDD = VDRIVE = 2.7 to 5.25V, REFIN = 2.5V, fSCLK = 20MHz (50% Duty cycle), VCMIN = VREFIN/2 (when SE/FDN = 0),
TAMB = -40 to +85°C. Typical values at TAMB = +25°C and VDD = VDRIVE = 5.25V (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
DC Accuracy
Resolution
INL Integral Nonlinearity
DNL
Differential Nonlinearity
Straight Binary Output Coding;
Guaranteed No Missed Codes to 12 Bits
Offset Error
Offset Error Match
Gain Error
Bit RANGE = 1
Gain Error Match
Offset Error
Offset Error Match
Gain Error
Bit SE/FDN = 1,
bit CODING = 1
Bit RANGE = 0
Gain Error Match
Zero Code Error
Zero Code Error Match
Gain Error
Bit RANGE = 1
Gain Error Match
Zero Code Error
Bit SE/FDN = 0,
bit CODING = 0
Zero Code Error Match
Gain Error
Bit RANGE = 0
Gain Error Match
Dynamic Specifications 50kHz sinewave input
SINAD
Signal to Noise +
Distortion Ratio
SNR
THD
Signal-to-Noise Ratio Bit RANGE = 1,
Total Harmonic Distortion bit SE/FDN = 1
SFDR
Spurious-Free Dynamic
Range
SINAD
SNR
THD
SFDR
Signal to Noise +
Distortion
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic
Range
Bit RANGE = 0,
bit SE/FDN = 0,
bit CODING = 0
IMD
Intermodulation Distortion
fA = 40.1kHz,
fB = 41.5kHz
Second Order Terms
Third Order Terms
Channel-to-Channel
Isolation
fIN = 400kHz
Full Power Bandwidth
@ 3dB
@ 0.1dB
Min
-0.95
68
69.5
73
Typ
±0.5
±0.6
±0.5
±0.6
±0.6
±0.5
±0.5
±0.6
±0.5
±0.5
71.2
71.8
-82
84
71
71.5
-83
85
-83
-91
-79
35
3.6
Max Unit
12 Bits
±1 LSB
+1.2 LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
±4 LSB
LSB
dB
dB
dB
dB
dB
dB
-71 dB
dB
dB
dB
MHz
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Revision 1.00
5 - 29
5 Page 
AS1542
Data Sheet - Typical Operating Characteristics
Figure 15. Supply Current vs. Supply Voltage
3
2.5 fMAX
2
Static
1.5
1
2.7 3.2 3.7 4.2 4.7 5.2
Supply Voltage (V)
Figure 17. Shutdown Supply Current vs. VDD
10
9
8
7
6
5
4
3
2
1
2.7
3.2 3.7 4.2 4.7
Supply Voltage (V)
5.2
Figure 19. Supply Current vs. Throughput Rate
10
1
0.1
0.01
0.001
0.1
10 1000
Throughput Rate (ksps)
Figure 16. Supply Current vs. Temperature
3.2
3.1
3
2.9
2.8
-40
-15 10 35 60
Temperature (°C)
85
Figure 18. Shutdown Supply Current vs. Temp.
50
40
30
20
10
0
-40
-15 10 35 60
Temperature (°C)
85
Figure 20. PSRR vs. Supply Signal Frequency
-60
-65
-70
-75
-80
-85
-90
0
VDD = 5V
VDD = 3V
200 400 600 800 1000
Ripple Frequency (kHz)
www.austriamicrosystems.com
Revision 1.00
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