ADS6245 Datasheet, PDF (4/76 Pages) Texas Instruments – DUAL CHANNEL, 14-BIT, 125/105/80/65 MSPS ADC WITH SERIAL LVDS OUTPUTS

ADS6245, ADS6244
ADS6243, ADS6242
SLAS542A – MAY 2007 – REVISED JULY 2007
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
SUPPLIES
AVDD Analog supply voltage
LVDD LVDS Buffer supply voltage
ANALOG INPUTS
Differential input voltage range
Input common-mode voltage
Voltage applied on VCM in external reference mode
CLOCK INPUT
ADS6245
Input clock sample rate, F_s
ADS6244
ADS6243
ADS6242
Sine wave, ac-coupled
LVPECL, ac-coupled
Input clock amplitude differential (V_CLKP – V_CLKM) _{LVDS, ac-coupled}
LVCMOS, ac-coupled
Input Clock duty cycle
DIGITAL OUTPUTS
C_LOAD
Maximum external load capacitance from each
output pin to DGND
Without internal termination
With internal termination
R_LOAD Differential load resistance (external) between the LVDS output pairs
T_A
Operating free-air temperature
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MIN NOM MAX UNIT
3.0 3.3 3.6 V
3.0 3.3 3.6 V
2
V_pp
1.5
±0.1
V
1.45 1.50 1.55 V
5
5
5
5
0.4 1.5
± 0.8
± 0.35
3.3
35% 50%
125
105
MSPS
80
65
V_pp
65%
5
10
100
–40
pF
Ω
85 °C
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 = 3.3 V, maximum rated sampling frequency, 50% clock duty cycle, –1dBFS differential analog input, internal reference
mode (unless otherwise noted).
PARAMETER
RESOLUTION
ANALOG INPUT
Differential input voltage
range
Differential input
capacitance
Analog input bandwidth
Analog input common mode
current (per input pin of
each ADC)
REFERENCE VOLTAGES
VREFB Internal reference bottom
voltage
VREFT Internal reference top
voltage
ΔV_REF
Internal reference error,
(VREFT–VREFB)
VCM
Common mode output
voltage
ADS6245
F_s = 125 MSPS
MIN TYP MAX
14
2.0
7
500
155
1.0
2.0
–15
±2
15
1.5
ADS6244
F_s = 105 MSPS
MIN TYP MAX
14
2.0
7
500
130
1.0
2.0
–15
±2 15
1.5
ADS6243
F_s = 80 MSPS
MIN TYP MAX
14
2.0
7
500
100
1.0
2.0
–15
±2
15
1.5
ADS6242
F_s = 65 MSPS
MIN TYP MAX
14
2.0
7
500
81
1.0
2.0
–15
±2
15
1.5
UNIT
Bits
V_PP
pF
MHz
μA
V
V
mV
V
4
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