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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Burr Brown Products
from Texas Instruments
12-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER
FEATURES
250-kHz Sampling Rate
4-V, 5-V, 10-V, ±3.33-V, ±5-V, and ±10-V Input
Ranges
73-dB SINAD With 45-kHz Input
±0.45 LSB Max INL
±0.45 LSB Max DNL, 12-Bits No Missing
Codes
1 LSB Bipolar Zero Errors
0.4 PPM/ C Bipolar Zero Error Drift
Six Specified Input Ranges
SPI Compatible Serial Output with
Daisy-Chain (TAG) Feature
5-V Supply
Pin-Compatible With ADS7808 (Low Speed)
and 16-Bit ADS8509/7809
Uses Internal or External Reference
70-mW Typ Power Dissipation at 250 KSPS
20-Pin SO Package
Simple DSP Interface
9.8 k
R1
IN
4.9 k
R2
IN
2.5 k
10 k
R3
IN
CAP
REF
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
APPLICATIONS
Industrial Process Control
Data Acquisition Systems
Digital Signal Processing
Medical Equipment
Instrumentation
DESCRIPTION
The ADS8508 is a complete 12-bit sampling
analog-to-digital (A/D) converter using state-of-the-art
CMOS structures. It contains a complete 12-bit,
capacitor-based, successive approximation register
(SAR) A/D converter with sample-and-hold, refer-
ence, clock, and a serial data interface. Data can be
output
using
synchronized to an external data clock. The ADS8508
also provides an output synchronization pulse for
ease of use with standard DSP processors.
The ADS8508 is specified at a 250-kHz sampling rate
over the full temperature range. Precision resistors
provide various input ranges including ±10 V and 0 V
to 5 V, while the innovative design allows operation
from a single +5-V supply with power dissipation
under 100 mW.
The ADS8508 is available in a 20-pin SO package,
fully specified for operation over the industrial -40°C
to 85°C temperature range.
Successive Approximation Register
CDAC
Comparator
Internal
Buffer
+2.5 V Ref
4 k
ADS8508
SLAS433 – SEPTEMBER 2005
the
internal
clock
or
can
Clock
EXT/INT
BUSY
Serial
DATACLK
Data
DATA
Out
&
R/C
Control
SB/BTC
CS
PWRD
Copyright © 2005, Texas Instruments Incorporated
be

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ADS8508 Summary of contents

  • Page 1

    ... V and while the innovative design allows operation from a single +5-V supply with power dissipation under 100 mW. The ADS8508 is available in a 20-pin SO package, fully specified for operation over the industrial -40°C to 85°C temperature range. Successive Approximation Register ...

  • Page 2

    ... TEST CONDITIONS Acquire and convert www.ti.com (1) PACKAGE ORDERING TRANSPORT DESIGNATOR NUMBER MEDIA, QTY ADS8508IBDW Tube ADS8508IBDWR Tape and Reel, 2000 ADS8508 ±25 V ±25 V ± 0 AGND2 - 0.3 V ANA ± 0.3 V DIG 165°C –65°C to 150°C 700 mW 260° ...

  • Page 3

    ... kHz I –60-dB Input kHz I FS Step No load Ext. 2.5-V Ref. and Figure 29. Adjustable to zero with external potentiometer. Factory calibrated with 0.1%, ADS8508 SLAS433 – SEPTEMBER 2005 Figure 28 and ADS8508IB UNIT MIN TYP MAX -0.5 0.5 %FS -0.5 0.5 ±7 ppm/°C -0.5 0.5 %FS -0.5 0.5 ±2 ppm/°C ...

  • Page 4

    ... V IH EXT/INT Low EXT/INT High I = 1.6 mA SINK I = 500 µA SOURCE Hi-Z state OUT DIG Hi-Z state Must be V ANA f = 250 kHz S www.ti.com Figure 28 and ADS8508IB UNIT MIN TYP MAX ±10 µA ±10 µA 9 MHz 0.1 26 MHz 0 ±5 µ 4. ...

  • Page 5

    ... PWRD BUSY CAP REF 6 15 R/C AGND2 7 14 TAG SB/BTC 8 13 DATA EXT/INT 9 12 DATACLK 10 11 DGND SYNC ADS8508 SLAS433 – SEPTEMBER 2005 MIN TYP MAX UNIT 2.2 µ 2.2 µs 1.8 µs 4 µs 270 ns 110 ...

  • Page 6

    ... O Serial data output. Data is synchronized to DATACLK, with the format determined by the level of SB/BTC. In the external clock mode, after 16 bits of data, the ADS8508 outputs the level input on TAG as long low and R/C is high (see and falling edges of DATACLK, and between conversions DATA stays at the level of the TAG input when the conversion was started ...

  • Page 7

    ... CS Set Low, Discontinuous Ext DATACLK Figure 1. Critical Timing d11 (N+1)th Accquisition (N+1)th Conversion t t acq conv TAG = Nth Conversion Data 8 starts READ ADS8508 SLAS433 – SEPTEMBER 2005 t su1 d11 Error (N+2)th Accquisition Correction t acq TAG = 0 7 ...

  • Page 8

    ... ADS8508 SLAS433 – SEPTEMBER 2005 PARAMETER MEASUREMENT INFORMATION (continued R BUSY d11 Error STATUS Nth Conversion Correction t conv t su1 External 1 12 DATACLK No more data to DATA TAG = 0 shift out EXT/INT tied high, CS and TAG are tied low Figure 3. Basic Conversion Timing - External DATACLK ...

  • Page 9

    ... Nth Conversion Data t d8 D04 D03 D02 D01 D00 + t Starts READ w1 su1 . d11 su1 Nth Conversion Data t d8 D04 D03 D02 D01 D00 Null T00 Txx T12 T13 T14 T15 T16 T17 Tyy ADS8508 ...

  • Page 10

    ... ADS8508 SLAS433 – SEPTEMBER 2005 PARAMETER MEASUREMENT INFORMATION (continued R BUSY t d3 STATUS t su3 t t su1 su1 t su1 External 0 DATACLK t d7 SYNC = 0 DATA EXT/INT tied high, CS and TAG tied low Figure 7. Read During Conversion With SYNC (Discontinuous External DATACLK ...

  • Page 11

    ... PARAMETER MEASUREMENT INFORMATION (continued) Figure 8. Conversion and Read Timing with Continuous External DATACLK (EXT/INT Tied High) Read After Conversions (Not Recommended) ADS8508 SLAS433 – SEPTEMBER 2005 11 ...

  • Page 12

    ... ADS8508 SLAS433 – SEPTEMBER 2005 PARAMETER MEASUREMENT INFORMATION (continued) Figure 9. Conversion and Read Timing with Continuous External DATACLK (EXT/INT Tied High) Read Previous Conversion Result During Conversion (Not Recommended) 12 www.ti.com ...

  • Page 13

    ... INPUT FREQUENCY −100 −90 −80 −70 −60 −50 −40 −30 −20 − 100 1000 f − Input Frequency − kHz i Figure 17. ADS8508 SLAS433 – SEPTEMBER 2005 SIGNAL-TO-NOISE RATIO vs FREE-AIR TEMPERATURE kHz i 40 −40 − − Free-Air-Temperature − Figure 12 ...

  • Page 14

    ... ADS8508 SLAS433 – SEPTEMBER 2005 TYPICAL CHARACTERISTICS (continued) FULL SCALE ERROR vs FREE-AIR TEMPERATURE 0.20 External Reference, 0. Range for 5 Representative Parts 0.10 0.05 0 −0.05 −0.10 −0.15 −0.20 −40 −25 − − Free-Air Temperature − Figure 19. 0 250 KSPS 0.4 s 0.3 0.2 0.1 0 −0.1 − ...

  • Page 15

    ... FFT (1 kHz Input − Frequency − Hz Figure 24. FFT (45 kHz Input − Frequency − Hz Figure 25. ADS8508 SLAS433 – SEPTEMBER 2005 8192 Points f = 250 KSPS kHz, 0dB i SINAD = 73.47 dB THD = −94.03 dB 100 125 100 125 15 ...

  • Page 16

    ... MSB first. The first conversion immediately following a power-up will not produce a valid conversion result. Data can be clocked out with either the internally generated clock or with an external clock. The EXT/INT pin controls this function. If external clock is used the TAG input can be used to daisy-chain multiple ADS8508 data pins together. ...

  • Page 17

    ... Data always represents the conversion already completed. TAG FEATURE The TAG feature allows the data from multiple ADS8508 converters to be read on a single serial line. The converters are cascaded together using the DATA pins as outputs and the TAG pins as inputs as illustrated in Figure 26 ...

  • Page 18

    ... V to 2.7 V. The internal reference will be approximately 2.5 V. The reference, whether internal or external, is buffered internally with a buffer with its output on pin 5 (CAP). The ADS8508 is factory tested with 2.2-µF capacitors connected to pins 5 and 6 (CAP and REF). Each capacitor should be placed as close as possible to its pin. The capacitor on pin 6 band limits the internal reference noise. A smaller capacitor can be used but it may degrade SNR and SINAD The capacitor on pin 5 stabilizes the reference buffer and provides switching charge to the CDAC during conversion. Capacitors smaller than 1 µ ...

  • Page 19

    ... DATACLK. Conversion n in process 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 ...

  • Page 20

    ... ADS8508 SLAS433 – SEPTEMBER 2005 Selecting output format Table 5. Output Codes and Ideal Input Voltages DESCRIP- ANALOG INPUT TION Full-scale ±10 ±5 ±3.33 V range Least signifi- cant bit 4.88 mV 2.44 mV 1.63 mV (LSB) Full scale 9.99512 V 4.997567 V 3.33171 V (FS - 1LSB) Midscale ...

  • Page 21

    ... CAP 50 k REF 2 2.2 F AGND2 AGND1 100 CAP 50 k REF + AGND2 ADS8508 SLAS433 – SEPTEMBER 2005 With Trim R1 IN AGND1 100 2 CAP 576 REF + 2.2 F AGND2 R1 IN AGND1 100 R2 33.2 k ...

  • Page 22

    ... ADS8508 SLAS433 – SEPTEMBER 2005 Input Range Without Trim V IN 100 2.2 F 200 100 33 2.2 F Figure 29. Offset/Gain Circuits for Bipolar Input Ranges 22 (Adjust Offset First Then Adjust Gain) 200 R1 IN AGND1 100 ...

  • Page 23

    ... ADS8508IBDW ACTIVE ADS8508IBDWG4 ACTIVE ADS8508IBDWR ACTIVE ADS8508IBDWRG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 24

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  • Page 26

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...

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