Datasheet
ADS8327
ADS8328
www.ti.com
SLAS415E – APRIL 2006– REVISED JANUARY 2011
SPECIFICATIONS (continued)
T
A
= –40°C to 85°C, +VA = 4.5 V to 5.5 V, +VBD = 1.65 V to 5.5 V, V
REF
= 4.096 V, and f
SAMPLE
= 500 kHz, unless otherwise
noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DYNAMIC CHARACTERISTICS
V
IN
= 4.096 V
PP
at 10 kHz -96
THD Total harmonic distortion
(4)
V
IN
= 4.096 V
PP
at 100 kHz, ADS8327/28IB –95.7 dB
V
IN
= 4.096 V
PP
at 100 kHz, ADS8327/28I –95.7
V
IN
= 4.096 V
PP
at 10 kHz 91
SNR Signal-to-noise ratio dB
V
IN
= 4.096 V
PP
at 100 kHz 89
V
IN
= 4.096 V
PP
at 10 kHz 91
SINAD Signal-to-noise + distortion dB
V
IN
= 4.096 V
PP
at 100 kHz 88
V
IN
= 4.096 V
PP
at 10 kHz 100
SFDR Spurious-free dynamic range V
IN
= 4.096 V
PP
at 100 kHz, ADS8327/28IB 98.8 dB
V
IN
= 4.096 V
PP
at 100 kHz, ADS8327/28I 98.8
–3dB Small-signal bandwidth 30 MHz
CLOCK
Internal conversion clock frequency 10.9 12 12.6 MHz
Used as I/O clock only 50
SCLK External serial clock MHz
As I/O clock and conversion clock 1 21
EXTERNAL VOLTAGE REFERENCE INPUT
V
REF
(REF+ – REF–) 5.5 V ≥ +VA ≥ 4.5 V 0.3 4.096 4.2
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 5.5 V ≥ +VBD ≥ 4.5 V 0.65 × (+VBD) +VBD + 0.3 V
V
IL
Low-level input voltage 5.5 V ≥ +VBD ≥ 4.5 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
5.5 V ≥ +VBD ≥ 4.5 V,
V
OH
High-level output voltage +VBD – 0.6 +VBD V
I
O
= 100 mA
5.5 V ≥ +VBD ≥ 4.5 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 3.3 5.5 V
Power supply
voltage
+VA 4.5 5 5.5 V
500-kHz Sample rate 5 6.2
mA
Supply current NAP/Auto-NAP mode 0.3 0.5
Deep power-down mode 6 50 nA
Buffer I/O supply current 500 kSPS 1 mA
+VA = 5 V, +VBD = 5 V 30 38.5
Power dissipation mW
+VA = 5 V, +VBD = 1.8 V 25.4 32
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 7
Product Folder Link(s): ADS8327 ADS8328