Datasheet

ADS6445, ADS6444
ADS6443, ADS6442
www.ti.com SLAS531B –MAY 2007–REVISED DECEMBER 2009
ELECTRICAL CHARACTERISTICS
Typical values are at 25°C, min and max values are across the full temperature range T
MIN
= –40°C to T
MAX
= 85°C, AVDD =
LVDD = 3.3V, maximum rated sampling frequency, 50% clock duty cycle, –1dBFS differential analog input, internal reference
mode (unless otherwise noted).
ADS6445 ADS6444 ADS6443 ADS6442
F
s
= 125 MSPS F
s
= 105 MSPS F
s
= 80 MSPS F
s
= 65 MSPS
PARAMETER UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
RESOLUTION 14 14 14 14 Bits
ANALOG INPUT
Differential input voltage 2.0 2.0 2.0 2.0 V
PP
range
Differential input 7 7 7 7 pF
capacitance
Analog input bandwidth 500 500 500 500 MHz
Analog input common mode 155 130 100 81 μA
current (per input pin of
each ADC)
REFERENCE VOLTAGES
VREFB Internal reference bottom 1.0 1.0 1.0 1.0 V
voltage
VREFT Internal reference top 2.0 2.0 2.0 2.0 V
voltage
ΔV
REF
Internal reference error -15 ± 2 15 -15 ± 2 15 -15 ± 2 15 -15 ± 2 15 mV
(VREFT–VREFB)
VCM Common mode output 1.5 1.5 1.5 1.5 V
voltage
VCM output current ±4 ±4 ±4 ±4 mA
capability
DC ACCURACY
No missing codes Assured Assured Assured Assured
E
O
Offset error, across devices –15 ±2 15 –15 ±2 15 –15 ±2 15 –15 ±2 15 mV
and across channels within
a device
Offset error temperature 0.05 0.05 0.05 0.05 mV/°C
coefficient, across devices
and across channels within
a device
There are two sources of
gain error - internal
reference inaccuracy and
channel gain error
E
GREF
Gain error due to internal -0.75 0.1 0.75 -0.75 0.1 0.75 -0.75 0.1 0.75 -0.75 0.1 0.75 % FS
reference inaccuracy alone,
(ΔV
REF
/2.0) %
Reference gain error 0.0125 0.0125 0.0125 0.0125 Δ%/°C
temperature coefficient
E
GCHAN
Gain error of channel alone, –1 ±0.3 1 –1 ±0.3 1 –1 ±0.3 1 –1 ±0.3 1 % FS
across devices and across
channels within a device
(1)
Channel gain error 0.005 0.005 0.005 0.005 Δ%/°C
temperature coefficient,
across devices and across
channels within a device
Differential nonlinearity, Fin –0.9 ±0.6 2.0 –0.9 ±0.6 2.0 –0.9 ±0.5 1.8 –0.9 ±0.5 1.8 LSB
DNL
= 50 MHz
Integral nonlinearity, Fin = -5 ±3 5 -0.5 ±3 5 4.5 ±2 4.5 4.5 ±2 4.5 LSB
INL
50 MHz
PSRR DC power supply rejection 0.5 0.5 0.5 0.5 mV/V
ratio
POWER SUPPLY
I
CC
Total supply current 502 410 360 320 mA
I
AVDD
Analog supply current 410 322 280 245 mA
(1) This is specified by design and characterization; it is not tested in production.
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