ADS7279 Datasheet, PDF (4/46 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 = 5V (continued)
At T_A = –40°C to +85°C, +VA = 5V, +VBD = +1.65V to +5.5V, V_REF = 5V, and f_SAMPLE = 1MHz, 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 = 5V_PP at 10kHz
V_IN = 5V_PP at 100kHz
V_IN = 5V_PP at 10kHz
V_IN = 5V_PP at 100kHz
V_IN = 5V_PP at 10kHz
V_IN = 5V_PP at 100kHz
V_IN = 5V_PP at 10kHz
V_IN = 5V_PP at 100kHz
–100.1
–89.1
85.9
81.0
84.3
85.7
82.7
105.3
91.3
30
dB
dB
dB
dB
MHz
CLOCK
Internal conversion clock frequency
21
23
24.5 MHz
SCLK external serial clock
Used as I/O clock only
As I/O clock and conversion clock
50
MHz
1
42
EXTERNAL VOLTAGE REFERENCE INPUT
V_REF
Input
reference
range
Resistance ⁽⁵⁾
V_REF[REF+ – (REF–)]
(REF–) – AGND
Reference input
0.3
5
–0.1
40
+VA
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
5.5V ≥ +VBD ≥ 4.5V
5.5V ≥ +VBD ≥ 4.5V
V_I = +VBD or BDGND
5.5V ≥ +VBD ≥ 4.5V,
I_O = 100µA
5.5V ≥ +VBD ≥ 4.5V,
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 ^+VBD
voltage
+VA
1.65
3.3
4.5
5
5.5
V
5.5
V
Supply current
1MHz Sample rate
Nap or Auto Nap mode
5.7
7.0
mA
0.3
0.5
PD Mode
0.004
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 = 5V, BVDD = 1.8V
AVDD = 5V, BVDD = 3V
28.7
35.9
mW
30.0
38.6
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%.
4
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