TMS320F28027_12 Datasheet, PDF (111/129 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
www.ti.com
SPRS523I – NOVEMBER 2008 – REVISED JULY 2012
6.11.11 On-Chip Analog-to-Digital Converter
Table 6-38. ADC Electrical Characteristics
PARAMETER
MIN
TYP
MAX UNIT
DC SPECIFICATIONS
Resolution
12
Bits
ADC clock
60-MHz device
0.001
60 MHz
Sample Window
28027/26/23/22
7
28021/20/200
14
64 ADC
64 ^Clocks
ACCURACY
INL (Integral nonlinearity) at ADC Clock ≤ 30 MHz⁽¹⁾
–4
4 LSB
DNL (Differential nonlinearity) at ADC Clock ≤ 30 MHz,
no missing codes
Offset error ⁽²⁾
Executing Device_Cal
function
–1
1 LSB
–20
0
20 LSB
Executing periodic self-
recalibration ⁽³⁾
–4
0
4
Overall gain error with internal reference
–60
60 LSB
Overall gain error with external reference
–40
40 LSB
Channel-to-channel offset variation
–4
4 LSB
Channel-to-channel gain variation
–4
4 LSB
ADC temperature coefficient with internal reference
–50
ppm/°C
ADC temperature coefficient with external reference
–20
ppm/°C
V_REFLO
V_REFHI
ANALOG INPUT
–100
µA
100
µA
Analog input voltage with internal reference
0
3.3
V
Analog input voltage with external reference
V_REFLO input voltage⁽⁴⁾
V_REFHI input voltage⁽⁵⁾
Input capacitance
with V_REFLO = V_SSA
V_REFLO
V_SSA
1.98
V_REFHI
V
V_SSA
V
V_DDA
V
5
pF
Input leakage current
±5
μA
(1) INL will degrade when the ADC input voltage goes above V_DDA.
(2) 1 LSB has the weighted value of full-scale range (FSR)/4096. FSR is 3.3 V with internal reference and V_REFHI - V_REFLO for external
reference.
(3) Periodic self-recalibration will remove system-level and temperature dependencies on the ADC zero offset error. This can be performed
as needed in the application without sacrificing an ADC channel by using the procedure listed in the "ADC Zero Offset Calibration"
section of the TMS320x2802x, 2803x Piccolo Analog-to-Digital Converter (ADC) and Comparator Reference Guide (literature number
SPRUGE5).
(4) V_REFLO is always connected to V_SSA.
(5) V_REFHI must not exceed V_DDA when using either internal or external reference modes. Since V_REFHI is tied to ADCINA0, the input signal
on ADCINA0 must not exceed V_DDA.
Copyright © 2008–2012, Texas Instruments Incorporated
Electrical Specifications 111
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