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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PARAMETER MEASUREMENT INFORMATION
CS
R/C
t
su1
External
DATACLK
CS Set Low, Discontinuous Ext DATACLK
CS
t
su2
R/C
t
w1
R/C
t
t
d1
w2
BUSY
t
d3
Error
STATUS
Nth Conversion
Correction
t
conv
t
t
c1
d4
Internal
1
2
12
DATACLK
t
d6
t
d5
DATA
D 11
D 0
TAG = 0
(N− 1)th Conversion Data
CS, EXT/INT, and TAG are tied low
Figure 2. Basic Conversion Timing - Internal DATACLK (Read Previous Data During Conversion)
R/C
CS
t
t
su1
su1
External
DATACLK
R/C Set Low, Discontinuous Ext DATACLK
BUSY
t
su2
t
su3
External
DATACLK
CS Set Low, Discontinuous Ext DATACLK
Figure 1. Critical Timing
t
w1
t
d1
t
w2
t
d2
t
d3
t
d11
(N+1)th Accquisition
(N+1)th Conversion
t
t
acq
conv
t
d4
1
2
TAG = 0
D 11
Nth Conversion Data
8 starts READ
ADS8508
SLAS433 – SEPTEMBER 2005
t
su1
1
2
t
d2
t
d11
Error
(N+2)th Accquisition
Correction
t
acq
12
D 0
TAG = 0
7

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