SAR
Control
D
OUT
Comparator
S/H Amp
CS/SHDN
DCLOCK
+In
V
REF
In
CDAC
Serial
Interface
ADS7826
ADS7827
ADS7829
SLAS388 JUNE 2003
10/8/12-BIT HIGH SPEED 2.7 V microPOWERTM SAMPLING
ANALOG-TO-DIGITAL CONVERTER
FEATURES
DESCRIPTION
High Throughput at Low Supply Voltage
The ADS7826/27/29 is a family of 10/8/12-bit sampling
(2.7 V V
CC
)
analog-to-digital converters (A/D) with assured specifi-
ADS7829: 12-bit 125 KSPS
cations at 2.7-V supply voltage. It requires very little
ADS7826: 10-bit 200 KSPS
power even when operating at the full sample rate. At
ADS7827: 8-bit 250 KSPS
lower conversion rates, the high speed of the device
enables it to spend most of its time in the power down
Very Wide Operating Supply VoltageL:
mode-- the power dissipation is less than 60 W at 7.5
2.7 V to 5.25 V (as Low as 2.0 V With Reduced
kHz.
Performance)
The ADS7826/27/29 also features operation from 2.0 V
Rail-to-Rail, Pseudo Differential Input
to 5 V, a synchronous serial interface, and a differential
Wide Reference Voltage: 50 mV to V
CC
input. The reference voltage can be set to any level
within the range of 50 mV to V
CC
.
Micropower Auto Power-Down:
Less Than 60 W at 75 kHz, 2.7 V V
CC
Ultra-low power and small package size make the
ADS7826/27/29 family ideal for battery operated sys-
Low Power Down Current: 3 A Max
tems. It is also a perfect fit for remote data acquisition
Ultra Small Chip Scale Package:
modules, simultaneous multichannel systems, and iso-
8-pin 3 x 3 PDSO (SON, Same Size as QFN)
lated data acquisition. The ADS7826/27/29 family is
available in a 3 x 3 8-pin PDSO (SON, same size as
SPITM Compatible Serial Interface
QFN) package.
APPLICATIONS
Battery Operated Systems
Remote Data Acquisition
Isolated Data Acquisition
Simultaneous Sampling, Multichannel
Systems
microPOWER is a trademark of Texas Instruments.
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.
Copyright 2003, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily in-
clude testing of all parameters.
www.ti.com
ADS7826
ADS7827
ADS7829
SLAS388 JUNE 2003
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PACKAGE/ORDERING INFORMATION
MAXIMUM LINERARITY ERROR
SPECIFICATION
(LSB)
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
INTEGRAL
DIFFERENTIAL
PACKAGE (1)
RANGE
MARKING (2)
NUMBER
MEDIA
ADS7829I
2
2
SON-8
-40
C to 85C
F29
ADS7829IDRBR
Tape and reel
ADS7829IB
1.25
-1/1.25
SON-8
-40
C to 85
F29
ADS7829IBDRBR
Tape and reel
ADS7826I
1
1
SON-8
-40
C to 85C
F26
ADS7826IDRBR
Tape and reel
ADS7827I
1
1
SON-8
-40
C to 85C
F27
ADS7827IDRBR
Tape and reel
ADS7829I
2
2
SON-8
-40
C to 85C
F29
ADS7829IDRBT
Tape and reel
ADS7829IB
1.25
-1/1.25
SON-8
-40
C to 85C
F29
ADS7829IBDRBT
Tape and reel
ADS7826I
1
1
SON-8
-40
C to 85C
F26
ADS7826IDRBT
Tape and reel
ADS7827I
1
1
SON-8
-40
C to 85C
F27
ADS7827IDRBT
Tape and reel
(1)
For detail drawing and dimension table, see end of this data sheet or package drawing file on web.
(2)
Performance Grade information is marked on the reel.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1)
V
CC
6 V
Analog input
-0.3 V to (V
CC
+ 0.3 V)
Logic input
-0.3 V to 6 V
Case temperature
100
C
Junction temperature
150
C
Storage temperature
125
C
External reference voltage
5.5 V
(1)
Stresses beyond those listed under "absolute maximum ratings" 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 under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2
www.ti.com
www.ti.com
ADS7826
ADS7827
ADS7829
SLAS388 JUNE 2003
SPECIFICATIONS
At -40
C to 85C, V
CC
= 2.7 V, V
ref
= 2.5 V, unless otherwise specified.
ADS7829IB
ADS7829
ADS7826I
ADS7827I
TEST
PARAMETER
UNIT
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
ANALOG INPUT
Full-scale input
+In - (-In)
0
V
ref
0
V
ref
0
V
ref
0
V
ref
V
span
Absolute input
+In
-0.2
V
CC
+0.2
-0.2
V
CC
+0.2
-0.2
V
CC
+0.2
-0.2
V
CC
+0.2
V
range
-IN
-0.2
1.0
-0.2
1.0
-0.2
1.0
-0.2
1.0
V
Capacitance
25
25
25
25
pF
Leakage current
1
1
1
1
A
SYSTEM PERFORMANCE
Resolution
12
12
10
8
Bits
No missing codes
12
11
10
8
Bits
Integral linearity error
-1.25
0.4
1.25
-2
0.8
2
-1
0.3
1
-1
0.2
1
LSB (1)
Differential linearity error
-1
0.4
1.25
-2
0.8
2
-1
0.3
1
-1
0.2
1
LSB
Offset error
-3
0.3
3
-3
0.6
3
-2
0.4
2
-1
0.4
1
LSB
Gain error
-2
0.3
2
-2
0.6
2
-1
0.3
1
-1
0.2
1
LSB
Noise
33
33
33
33
Vrms
Power supply rejection
82
82
94
98
dB
SAMPLING DYNAMICS
Conversion time
12
12
10
8
DCLOCK
Cycles
Acquisition time
1.5
1.5
1.5
1.5
DCLOCK
Cycles
f
DCLOCK
16 x fsample
16 x fsample
14 x fsample
12 x fsample
kHz
Throughput
2.7 V
V
CC
125
125
200
250
kHz
(sample rate)
5.25 V (2)
fsample
2.0 V
V
CC
75
75
85
100
kHz
< 2.7 V (3) (2)
DYNAMIC CHARACTERISTICS
Total harmonic distortion
-82
-80
-78
-72
dB
SINAD
V
IN
= 2.5 Vpp at
72
70
62
50
dB
1 kHz
Spurious free
V
IN
= 2.5 Vpp at
85
82
81
68
dB
dynamic range
1 kHz
(SFDR)
REFERENCE INPUT
Voltage range
2.7 V
V
CC
3.6 V
0.05
V
CC
-0.2
0.05
V
CC
-0.2
0.05
V
CC
-0.2
0.05
V
CC
-0.2
V
Resistance
CS = GND,
5
5
5
5
G
f
SAMPLE
= 0 Hz
CS = V
CC
5
5
5
5
G
Current drain
Full speed at V
ref
/2
12
60
12
60
20
100
24
120
A
f
SAMPLE
= 7.5 kHz
0.8
0.8
0.8
0.8
A
CS = V
CC
0.001
3
0.001
3
0.001
3
0.001
3
A
DIGITAL INPUT/OUTPUT
Logic family
CMOS
CMOS
CMOS
CMOS
Logic levels
V
IH
I
IH
= +5 A
2.0
5.5
2.0
5.5
2.0
5.5
2.0
5.5
V
V
IL
I
IL
= +5 A
-0.3
0.8
-0.3
0.8
-0.3
0.8
-0.3
0.8
V
(1)
LSB means Least Significant Bit and is equal to V
ref
/ 2
N
where N is the resolution of ADC. For example, with V
ref
equal to 2.5 V, one
LSB is 0.61 mV for a 12 bit ADC (ADS7829).
(2)
See the Typical Performance Curves for V
CC
= 5 V and V
ref
= 5 V.
(3)
The maximum clock rate of the ADS7826/27/29 are less than 1.2 MHz at 2 V
V
CC
<2.7 V. The recommended regerence voltage is
between 1.25 V to 1.024 V.
3
www.ti.com
ADS7826
ADS7827
ADS7829
SLAS388 JUNE 2003
SPECIFICATIONS (continued)
At -40
C to 85C, V
CC
= 2.7 V, V
ref
= 2.5 V, unless otherwise specified.
ADS7829IB
ADS7829
ADS7826I
ADS7827I
TEST
PARAMETER
UNIT
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
V
OH
I
OH
= -250 A
2.2
2.1
2.1
2.1
V
V
OL
I
OL
= 250 A
0.4
0.4
0.4
0.4
V
Data format
Straight binary
Straight binary
Straight binary
Straight binary
POWER SUPPLY REQUIREMENTS
VCC
Operating range
2.7
3.6
2.7
3.6
2.7
3.6
2.7
3.6
V
See (3) and (2)
2.0
2.7
2.0
2.7
2.0
2.7
2.0
2.7
V
See (2)
3.6
5.25
3.6
5.25
3.6
5.25
3.6
5.25
V
Quiescent cur-
Full speed (4)
220
350
220
350
250
350
260
350
A
rent
f
SAMPLE
= 7.5 kHz
20
20
20
20
A
(5),
f
SAMPLE
= 7.5 kHz
180
180
180
180
A
(6)
Power down
CS = V
CC
3
3
3
3
A
TEMPERATURE RANGE
Specified performance
-40
85
-40
85
-40
85
-40
85
C
(4)
Full speed: 125 ksps for ADS7829, 200 ksps for ADS7826, and 250 ksps for ADS7827.
(5)
f
DCLOCK
= 1.2 MHz, CS = V
CC
for 145 clock cycles out of every 160 for the ADS7829I and ADS7829IB.
(6)
See the Power Dissipation section for more information regarding lower sample rates.
At -40
C to 85C, V
CC
= 5 V, V
ref
= 5 V, unless otherwise specified.
ADS7829IB
ADS7829
ADS7826I
ADS7827I
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
SYSTEM PERFORMANCE
Resolution
12
12
10
8
Bits
No missing codes
12
11
10
8
Bits
Integral linearity error
0.6
0.8
0.15
0.1
1 LSB (7)
Differential linearity error
0.5
0.8
0.15
0.1
1
LSB
ANALOG INPUT
Offset error
2.6
2.6
1.2
0.7
LSB
Gain error
1.2
1.2
0.2
0.1
LSB
REFERENCE INPUT
Voltage range
0.05
V
CC
0.05
V
CC
0.05
V
CC
0.05
V
CC
V
(7)
LSB means Least Significant Bit . With V
ref
equal to 5 V, one LSB is 1.22 mV for a 12 bit ADC.
4
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