The ADS8508 is a complete 12-bit sampling analog-to-digital (A/D) converter using state-of-the-art CMOS structures

 

ADS8508

Manufacturer Part NumberADS8508
DescriptionThe ADS8508 is a complete 12-bit sampling analog-to-digital (A/D) converter using state-of-the-art CMOS structures
ManufacturerTexas Instruments
ADS8508 datasheets

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Specifications of ADS8508

Resolution(bits)12Sample Rate (max)(sps)250kSPS
# Input Channels1InterfaceSerial SPI
Dnl(max)(+/-lsb)0.45Inl(max)(+/-lsb)0.45
Inl (+/-)(max)(%)0.01100Snr(db)73
Sinad(db)73Input Range+4V, 5V, 10V; +/-3.3V, 5V, 10V
Power Consumption(typ)(mw)70Reference ModeInt , Ext
ArchitectureSARAnalog Voltage Av/dd(min)(v)4.75
Analog Voltage Av/dd(max)(v)5.25Digital Supply(min)(v)4.75
Digital Supply(max)(v)5.25Operating Temperature Range(c)-40 to 85
Pin/package20SOICIntegrated FeaturesInternal Reference
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The external reference voltage can vary from 2.3 V to 2.7 V. The reference voltage determines the size of the
least significant bit (LSB). The larger reference voltages produce a larger LSB, which can improve SNR. Smaller
reference voltages can degrade SNR.
2.2 mF
100 nF
GND
1 kW
Pin 2
Vin
22 pF
GND
Figure 27. Typical Driving Circuitry (±10 V, No Trim)
Table 3. Input Range Connections (see
ANALOG
INPUT RANGE
±10 V
±5 V
±3.33 V
0 V to 10 V
0 V to 5 V
0 V to 4 V
SPECIFIC FUNCTION
CS
R/C
Initiate conversion and out-
1 > 0
0
put data using internal clock
0
1 > 0
Initiate conversion and out-
1 > 0
0
put data using external clock
0
1 > 0
1 > 0
1
1 > 0
1
0
0 > 1
Incorrect conversions
0
0
Power down
x
x
x
x
(1) See Figure XXX for the constraints on previous data valid during a conversion.
+15 V
22 pF
1 kW
10 pF
Pin 7
Pin 1
Pin5
−
GND
OPA 627
Pin 6
+
Pin3
Pin4
2.2 mF
GND
100 nF
− 15 V
Figure 28
information)
CONNECT R1
VIA
CONNECT R2
IN
200
TO
100
TO
V
AGND
IN
AGND
V
IN
V
V
IN
IN
AGND
V
IN
AGND
AGND
V
AGND
IN
Table 4. Control Truth Table
BUSY
EXT/INT
DATACLK
PWRD
1
0
Output
0
1
0
Output
0
1
1
Input
0
1
1
Input
0
1
1
Input
x
0
1
Input
0
0
1
Input
0
0 > 1
x
x
0
x
x
x
0
x
x
x
1
SLAS433 – SEPTEMBER 2005
ADS8508
200 W
R1
IN
AGND
100 W
R2
IN
33.2 kW
GND
R3
IN
CAP
AGND2
2.2 mF
2.2 mF
GND
and
Figure 29
for complete
VIA
CONNECT
IN
IMPEDANCE
R3 TO
CAP
11.5 k
CAP
6.7 k
CAP
5.4 k
AGND
6.7 k
V
5.0 k
IN
V
5.4 k
IN
SB/BTC
OPERATION
x
Initiates conversion n. Data from conversion n - 1
clocked out on DATA synchronized to 16 clock
x
pulses output on DATACLK.
x
Initiates conversion n.
x
Initiates conversion n.
x
Outputs a pulse on SYNC followed by data from
conversion n clocked out synchronized to external
DATACLK.
x
Outputs a pulse on SYNC followed by data from
conversion n - 1 clocked out synchronized to
x
(1)
external DATACLK.
Conversion n in process.
x
CS or R/C must be HIGH or a new conversion will
be initiated without time for acquisition.
x
Analog circuitry powered. Conversion can pro-
ceed..
x
Analog circuitry disabled. Data from previous
conversion maintained in output registers.
ADS8508
19

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