Datasheet

Spartan-7 FPGAs Data Sheet: DC and AC Switching Characteristics
DS189 (v1.9) March 13, 2019 www.xilinx.com
Product Specification 52
XADC Specifications
The 7 Series FPGAs Overview (DS180) [Ref 1] and XA Spartan-7 Automotive FPGA Data Sheet: Overview
(DS171) [Ref 2] list the devices that contain a 7 series XADC dual 12-Bit 1 MSPS analog-to-digital
converter.
Table 50: XADC Specifications
Parameter Symbol Comments/Conditions Min Typ Max Units
V
CCADC
= 1.8V ± 5%, V
REFP
= 1.25V, V
REFN
= 0V, ADCCLK = 26 MHz, –55°C ≤ T
j
≤ 125°C.
Typical values at T
j
= +40°C.
ADC Accuracy
(1)
Resolution 12 – – Bits
Integral nonlinearity
(2)
INL
–40°C ≤ T
j
≤ 100°C – – ±2 LSBs
–55°C ≤ T
j
< –40°C; 100°C < T
j
≤ 125°C – – ±3 LSBs
Differential nonlinearity DNL No missing codes, guaranteed monotonic. – – ±1 LSBs
Offset error
Unipolar
–40°C ≤ T
j
≤ 100°C – – ±8 LSBs
–55°C ≤ T
j
< –40°C; 100°C < T
j
≤ 125°C – – ±12 LSBs
Bipolar –55°C ≤ T
j
≤ 125°C – – ±4 LSBs
Gain error ––±0.5%
Offset matching ––4LSBs
Gain matching ––0.3%
Sample rate ––1MS/s
Signal to noise ratio
(2)
SNR F
SAMPLE
= 500 KS/s, F
IN
= 20 kHz 60 – – dB
RMS code noise
External 1.25V reference. – – 2 LSBs
On-chip reference. – 3 – LSBs
Total harmonic distortion
(2)
THD F
SAMPLE
= 500 KS/s, F
IN
= 20 kHz 70 – – dB
Analog Inputs
(3)
ADC input ranges
Unipolar operation. 0 – 1 V
Bipolar operation. –0.5 – +0.5 V
Unipolar common mode range (FS input). 0 – +0.5 V
Bipolar common mode range (FS input). +0.5 – +0.6 V
Maximum external channel input
ranges
Adjacent analog channels set within these
ranges should not corrupt measurements
on adjacent channels.
–0.1 – V
CCADC
V
Full-resolution bandwidth FRBW
Auxiliary channel full resolution
bandwidth.
250 – – kHz
On-chip Sensors
Temperature sensor error
–40°C ≤ T
j
≤ 100°C – – ±4 °C
–55°C ≤ T
j
< –40°C; 100°C < T
j
≤ 125°C – – ±6 °C
Supply sensor error
–40°C ≤ T
j
≤ 100°C – – ±1 %
–55°C ≤ T
j
< –40°C; 100°C < T
j
≤ 125°C – – ±2 %
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