Datasheet

ADS8327
ADS8328
www.ti.com SLAS415E – APRIL 2006– REVISED JANUARY 2011
SPECIFICATIONS (continued)
T
A
= –40°C to 85°C, +VA = 2.7 V to 3.6 V, +VBD = 1.65 V to 1.5 × (+VA), V
REF
= 2.5 V, and f
SAMPLE
= 500 kHz, unless
otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DYNAMIC CHARACTERISTICS
V
IN
= 2.5 V
PP
at 10 kHz –98
THD Total harmonic distortion
(4)
dB
V
IN
= 2.5 V
PP
at 100 kHz –83.5
V
IN
= 2.5 V
PP
at 10 kHz 88.5
SNR Signal-to-noise ratio dB
V
IN
= 2.5 V
PP
at 100 kHz 85
V
IN
= 2.5 V
PP
at 10 kHz 88.5
SINAD Signal-to-noise + distortion dB
V
IN
= 2.5 V
PP
at 100 kHz 81
V
IN
= 2.5 V
PP
at 10 kHz 101
SFDR Spurious-free dynamic range dB
V
IN
= 2.5 V
PP
at 100 kHz 84
–3dB small-signal bandwidth 30 MHz
CLOCK
Internal conversion clock frequency 10.5 11 12.2 MHz
Used as I/O clock only 33
SCLK External serial clock MHz
As I/O clock and conversion clock 1 21
EXTERNAL VOLTAGE REFERENCE INPUT
V
REF
(REF+ – REF–) 3.6 V ≥ +VA ≥ 2.7 V 0.3 2.525
Input reference
V
REF
V
range
(REF–) – AGND –0.1 0.1
Resistance
(5)
Reference input 80 kΩ
DIGITAL INPUT/OUTPUT
Logic family—CMOS
V
IH
High-level input voltage (+VA × 1.5) V ≥ +VBD ≥ 1.65 V 0.65 × (+VBD) +VBD + 0.3 V
V
IL
Low-level input voltage (+VA × 1.5) V ≥ +VBD ≥ 1.65 V –0.3 0.35 × (+VBD) V
I
I
Input current V
I
= +VBD or BDGND –50 50 nA
C
I
Input capacitance 5 pF
(+VA × 1.5) V ≥ +VBD ≥ 1.65 V,
V
OH
High-level output voltage +VBD – 0.6 +VBD V
I
O
= 100 mA
(+VA × 1.5) V ≥ +VBD ≥ 1.65 V,
V
OL
Low-level output voltage 0 0.4 V
I
O
= 100 mA
C
O
Output capacitance 5 pF
C
L
Load capacitance 30 pF
Data format—straight binary
POWER-SUPPLY REQUIREMENTS
+VBD 1.65 +VA 1.5 × (+VA) V
Power-supply
voltage
+VA 2.7 3.6 V
500-kHz Sample rate 3.8 5
mA
Supply current NAP/Auto-NAP mode 0.2 0.4
Deep power-down mode 2 50 nA
Buffer I/O supply current 500 kSPS 0.2 mA
Power dissipation +VA = 2.7 V, +VBD = 1.8 V 10.6 14 mW
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%.
© 2006–2011, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): ADS8327 ADS8328