ADS7279 Datasheet, PDF (6/46 Pages) Texas Instruments – LOW-POWER, 14-BIT, 1MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE

ADS7279
ADS7280
SBAS436 – MAY 2008........................................................................................................................................................................................................ www.ti.com
ELECTRICAL CHARACTERISTICS: V_REF = 2.5V (continued)
At T_A = –40°C to +85°C, +VA = 2.7V to 3.6V, +VBD = 1.65V to 1.5x(+VA), V_REF = 2.5V, f_SAMPLE = 1MHz for 3V ≤ +VA ≤ 3.6V,
and f_SAMPLE = 900kHz for 3V < +VA ≤ 2.7V using external clock, unless otherwise noted.
ADS7279, ADS7280
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
DYNAMIC CHARACTERISTICS
THD
Total harmonic distortion⁽⁴⁾
SNR
Signal-to-noise ratio
SINAD
Signal-to-noise + distortion
SFDR
Spurious-free dynamic range
–3dB small-signal bandwidth
V_IN = 2.5V_PP at 10kHz
V_IN = 2.5V_PP at 100kHz
V_IN = 2.5V_PP at 10kHz
V_IN = 2.5V_PP at 100kHz
V_IN = 2.5V_PP at 10kHz
V_IN = 2.5V_PP at 100kHz
V_IN = 2.5V_PP at 10kHz
V_IN = 2.5V_PP at 100kHz
–100.8
–88.4
81
83.1
82
83
81.4
102.6
89.8
30
dB
dB
dB
dB
MHz
CLOCK
Internal conversion clock frequency
21
22
23.5
MHz
Used as I/O clock only
SCLK external serial clock
As I/O clock and conversion clock
1
42
MHz
42
EXTERNAL VOLTAGE REFERENCE INPUT
V_REF
Input reference
range
Resistance ⁽⁵⁾
V_REF [REF+ –
(REF–)]
(REF–) – AGND
3.6V ≥ +VA ≥ 2.7V
Reference input
2.475
2.5
–0.1
40
2.525
V
0.1
kΩ
DIGITAL INPUT/OUTPUT
Logic family—CMOS
V_IH
High-level input voltage
V_IL
Low-level input voltage
I_I
Input current
C_i
Input capacitance
V_OH
High-level output voltage
V_OL
Low-level output voltage
C_O
Output capacitance
C_L
Load capacitance
Data format—straight binary
(+VA × 1.5)V ≥ +VBD ≥ 1.65V
(+VA × 1.5)V ≥ +VBD ≥ 1.65V
V_I = +VBD or BDGND
(+VA × 1.5)V ≥ +VBD ≥ 1.65V,
I_O = 100µA
(+VA × 1.5)V ≥ +VBD ≥ 1.65V,
I_O = 100µA
0.65 × (+VBD)
–0.3
–50
+VBD – 0.6
0
+VBD + 0.3
V
0.35 × (+VBD)
V
50
nA
5
pF
+VBD
V
0.4
V
5
pF
30
pF
POWER SUPPLY REQUIREMENTS
Power-supply
voltage
+VBD
+VA
f_s ≤ 1MHz
f_s ≤ 900kHz
1MHz sample rate,
3V ≤ +VA ≤ 3.6V
1.65
+VA
1.5 × (+VA)
V
3
3.6
V
2.7
3.6
4.5
6.0
Supply current
900kHz sample rate,
2.7V ≤ +VA ≤ 3V
4.2
mA
Nap or Auto Nap mode
0.25
0.4
PD Mode
0.001
1
µA
Buffer I/O supply current
1MSPS, BVDD = 1.8V
1MSPS, BVDD = 3V
0.1
0.5
mA
0.5
1.2
Power dissipation
AVDD = 3V, BVDD = 1.8V
AVDD = 3V, BVDD = 3V
13.7
18.9
mW
15.0
21.6
TEMPERATURE RANGE
T_A
Operating free-air temperature
–40
+85
°C
(4) Calculated on the first nine harmonics of the input frequency.
(5) Can vary ±30%.
6
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