ADC324X Datasheet, PDF (6/81 Pages) Texas Instruments – The ADC324x are a high-linearity

ADC3241, ADC3242, ADC3243, ADC3244
SBAS671B – JULY 2014 – REVISED MARCH 2015
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7.4 Thermal Information
THERMAL METRIC⁽¹⁾
ADC324x
RGZ (VQFN)
UNIT
48 PINS
R_θJA
R_θJC(top)
R_θJB
ψ_JT
ψ_JB
R_θJC(bot)
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
25.7
18.9
3.0
°C/W
0.2
3
0.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Performance Modes
over operating free-air temperature range (unless otherwise noted)
MODE
REGISTER SETTINGS
Special modes Registers 439h (bit 3) and 539h (bit 3)
Disable dither
Registers 1h (bits 5-2), 434h (bits 5 and 3), and
534h (bits 5 and 3)
Disable chopper Registers 422h (bit 1) and 522h (bit 1)
High IF modes
Registers 41Dh (bit 1), 51Dh (bit 1), and
608h (bits 7-6)
DESCRIPTION
Always set these bits high for best performance
Disable dither to improve SNR
Disable chopper to shift 1/f noise floor at dc
Improves HD3 for IF > 100 MHz
7.6 Electrical Characteristics: ADC3241, ADC3242
Typical values are over the operating free-air temperature range, at T_A = 25°C, full temperature range is T_MIN = –40°C to T_MAX
= 85°C, maximum sampling rate, 50% clock duty cycle, AVDD = DVDD = 1.8 V, and –1-dBFS differential input, unless
otherwise noted.
ADC3241
ADC3242
PARAMETER
MIN
TYP
MAX
MIN
TYP
MAX UNIT
ADC clock frequency
125
125 MSPS
1.8-V analog supply current
31
71
39
81 mA
1.8-V digital supply current
35
65
43
75 mA
Total power dissipation
118
205
147
245 mW
Global power-down dissipation
5
17
5
17 mW
Standby power-down dissipation
78
103
78
103 mW
6
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