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| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊模擬到數字轉換器參考手冊 |
| 文件頁數： | 100/122頁 |
| 文件大小： | 940K |
| 代理商： | QADCRM |
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MOTOROLA
A-4
ELECTRICAL CHARACTERISTICS
QADC
REFERENCE MANUAL
NOTES:
1. At V
RH
– V
RL
= 5.12 V, one count = 5 mV.
2. This parameter is periodically sampled rather than 100% tested.
3. Absolute error includes 1/2 count (2.5 mV) of inherent quantization error and circuit (differential, integral, and
offset) error. Specification assumes that adequate low-pass filtering is present on analog input pins — capacitive
filter with 0.01
μ
F to 0.1
μ
F capacitor between analog input and analog ground, typical source isolation imped-
ance of 20 K
.
4. Assumes f
sys
= 20.97 MHz.
5. Assumes clock prescaler values of:
QACR0: PSH = %01111, PSA = %1, PSL = 100)
CCW: BYP = %0
6. Assumes clock prescaler values of:
QACR0: PSH = %00110, PSA = %1, PSL = 010)
CCW: BYP = %0
7. Maximum source impedance is application-dependent. Error resulting from pin leakage depends on junction
leakage into the pin and on leakage due to charge-sharing with internal capacitance.
Error from junction leakage is a function of external source impedance and input leakage current. In the following
expression, expected error in result value due to junction leakage is expressed in voltage (V
errj
):
V
errj
= R
S
X I
OFF
where I
OFF
is a function of operating temperature. (See
Table A-2
, Note 7).
Charge-sharing leakage is a function of input source impedance, conversion rate, change in voltage between
successive conversions, and the size of the decoupling capacitor used. Error levels are best determined empir-
ically. In general, continuous conversion of the same channel may not be compatible with high source imped-
ance.
Table A-4 QADC Conversion Characteristics (Operating)
(V
DDI
and V
DDA
= 5.0 Vdc
±
5%, V
SSI
and V
SSA
= 0 Vdc, T
A
within operating temperature range,
0.5 MHz
≤
F
QCLK
≤
2.1 MHz, 2 clock input sample time)
Num
1
2
3
4
Parameter
Symbol
1 Count
DNL
INL
Min
—
—
—
Typ
5
—
—
Max
—
±
0.5
±
2.0
Unit
mV
Counts
Counts
Resolution
1
Differential nonlinearity
2
Integral nonlinearity
Absolute error
2,
3, 4
F
QCLK
= 0.999 MHz
5
PQA
PQB
F
QCLK
= 2.097 MHz
6
PQA
PQB
Source impedance at input
7
AE
—
—
—
—
—
—
—
—
±
2.5
±
2.5
±
4.0
±
4.0
Counts
5
R
S
—
20
—
k
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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