Datasheet

ADS7229
ADS7230
SBAS437A – MAY 2008 – REVISED JUNE 2009 ............................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= – 40 ° C to +85 ° C, +VA = 4.5V to 5.5V, +VBD = +1.65V to +5.5V, V
REF
= 5V, and f
SAMPLE
= 1MHz, unless otherwise
noted.
ADS7229, ADS7230
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DYNAMIC CHARACTERISTICS
V
IN
= 5V
PP
at 10kHz – 88.5
THD Total harmonic distortion
(4)
dB
V
IN
= 5V
PP
at 100kHz – 85.5
V
IN
= 5V
PP
at 10kHz 73.9
SNR Signal-to-noise ratio dB
V
IN
= 5V
PP
at 100kHz 72 73.8
V
IN
= 5V
PP
at 10kHz 73.7
SINAD Signal-to-noise + distortion dB
V
IN
= 5V
PP
at 100kHz 73.3
V
IN
= 5V
PP
at 10kHz 93.4
SFDR Spurious-free dynamic range dB
V
IN
= 5V
PP
at 100kHz 90.5
– 3dB small-signal bandwidth 30 MHz
CLOCK
Internal conversion clock frequency 21 23 24.5 MHz
Used as I/O clock only 50
SCLK external serial clock MHz
As I/O clock and conversion clock 1 42
EXTERNAL VOLTAGE REFERENCE INPUT
Input V
REF
[(REF+) – (REF – )] 0.3 +VA
V
REF
reference V
(REF – ) – AGND – 0.1 0.1
range
Resistance
(5)
Reference input 40 k Ω
DIGITAL INPUT/OUTPUT
Logic family — CMOS
V
IH
High-level input voltage 5.5V ≥ +VBD ≥ 4.5V 0.65 × (+VBD) +VBD + 0.3 V
0.35 ×
V
IL
Low-level input voltage 5.5V ≥ +VBD ≥ 4.5V – 0.3 V
(+VBD)
I
I
Input current V
I
= +VBD or BDGND – 50 50 nA
C
I
Input capacitance 5 pF
5.5V ≥ +VBD ≥ 4.5V,
V
OH
High-level output voltage +VBD – 0.6 +VBD V
I
O
= 100 µ A
5.5V ≥ +VBD ≥ 4.5V,
V
OL
Low-level output voltage 0 0.4 V
I
O
= 100 µ A
C
O
Output capacitance 5 pF
C
L
Load capacitance 30 pF
Data format — straight binary
POWER-SUPPLY REQUIREMENTS
+VBD 1.65 3.3 5.5 V
Power-supply
voltage
+VA 4.5 5 5.5 V
1MHz sample rate 5.7 7.0
mA
Supply current Nap or Auto Nap mode 0.3 0.5
Deep power-down mode 4 1 µ A
1MSPS, BVDD = 1.8V 0.1 0.5
Buffer I/O supply current mA
1MSPS, BVDD = 3V 0.5 1.2
AVDD = 5V, BVDD = 1.8V 28.8 36.5
Power dissipation mW
AVDD = 5V, BVDD = 3V 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%.
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