Datasheet

ADS8634
ADS8638
www.ti.com SBAS541A –MAY 2011– REVISED AUGUST 2011
ELECTRICAL CHARACTERISTICS: ADS8634, ADS8638 (continued)
Minimum/maximum specifications at T
A
= –40°C to +125°C, f
SAMPLE
= 1MSPS, HVDD = 10V to 15V, HVSS = –10V to –15V,
AVDD = 4.75V to 5.25V, DVDD = 2.7V to 3.6V, and V
REF
= 2.5V, unless otherwise noted. Typical specifications at +25°C,
f
SAMPLE
= 1MHz, HVDD = 10V, HVSS = –10V, AVDD = 3.3V, DVDD = 3.3V, and V
REF
= 2.5V, unless otherwise noted.
ADS8634, ADS8638
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER-SUPPLY REQUIREMENTS
V
AVDD
2.7 3.3 5.25 V
V
DVDD
1.65 3.3 5.25 V
Supply voltage
V
HVDD
10V < V
HVDD
– V
HVSS
< 30V 5 10 15 V
V
HVSS
10V < V
HVDD
– V
HVSS
< 30V –15 –10 0 V
At V
AVDD
= 2.7V to 3.6V and 1MHz throughput, normal mode
2.5 mA
with internal reference and temperature sensor off
I
AVDD(dynamic)
At V
AVDD
= 4.75V to 5.25V and 1MHz throughput, normal mode
3.1 3.6 mA
with internal reference and temperature sensor off
At V
AVDD
= 2.7V to 3.6V and SCLK off, normal mode with
1.45 mA
internal reference and temperature sensor off
AVDD supply
I
AVDD(static)
current
At V
AVDD
= 4.75V to 5.25V and SCLK off, normal mode with
1.5 1.9 mA
internal reference and temperature sensor off
At V
AVDD
= 2.7V to 5.25V, additional AVDD current with internal
I
AVDD(ref)
(8)
180 µA
reference on and temperature sensor off
At V
AVDD
= 2.7V to 5.25V, additional AVDD current with internal
I
AVDD(temp)
(9)
400 µA
temperature sensor on and internal reference off
I
HVDD(dynamic)
HVDD = 15V and 1MSPS throughput 270 350 µA
HVDD supply
current
I
HVDD(static)
HVDD = 15V and device static with SCLK off 5 µA
I
HVSS(dynamic)
HVSS = –15 V and 1MSPS throughput 520 µA
HVSS supply
current
I
HVSS(static)
HVSS = –15V and device static with SCLK off 5 µA
DVDD supply
I
DVDD
DVDD = 3.3V, f
SAMPLE
= 1MSPS, DOUT load = 20pF 2.5 mA
current
(10)
SCLK off, internal reference and temperature sensor off 10 µA
AVDD current
SCLK on, internal reference and temperature sensor off 160 µA
Power-down state
HVDD current 5 µA
HVSS current 5 µA
TEMPERATURE RANGE
Specified performance –40 +125 °C
(8) Add I
AVDD(ref)
to I
AVDD(dynamic)
or I
AVDD(static)
(as applicable), if internal reference is selected.
(9) Add I
AVDD(temp)
to I
AVDD(dynamic)
or I
AVDD(static)
(as applicable), if internal temperature sensor is enabled.
(10) I
DVDD
consumes only dynamic current. I
DVDD
= C
LOAD
× V
DVDD
× number of 0 → 1 transitions in DOUT × f
SAMPLE
. I
DVDD
is a
load-dependent current; there is no current when the output is not toggling.
THERMAL INFORMATION
ADS8634/8RGE
THERMAL METRIC
(1)
RGE UNITS
24 PINS
θ
JA
Junction-to-ambient thermal resistance 32.6
θ
JCtop
Junction-to-case (top) thermal resistance 30.5
θ
JB
Junction-to-board thermal resistance 3.3
°C/W
ψ
JT
Junction-to-top characterization parameter 0.4
ψ
JB
Junction-to-board characterization parameter 9.3
θ
JCbot
Junction-to-case (bottom) thermal resistance 2.6
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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Product Folder Link(s): ADS8634 ADS8638