MC68HC812A4 Datasheet, PDF (327/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Electrical Characteristics
Analog Converter Operating Characteristics
18.9 Analog Converter Operating Characteristics
Characteristic⁽¹⁾
Symbol
Min Typical
Max
Unit
8-bit resolution⁽²⁾
2 counts
—
24
—
mV
Differential non-linearity⁽³⁾
DNL
−0.5
—
+0.5 count
Integral non-linearity⁽³⁾
INL
−1
—
+1
count
Absolute error^(3),(4)
2, 4, 8, and 16 ATD sample clocks
AE
−2
—
+2
count
Maximum source impedance
R_S
—
20
See note^{(5) kΩ}
1. V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, T_A = T_L to T_H, ATD clock = 2 MHz, unless otherwise noted
2. V_RH−V_RL ≥ 5.12 V; V_DDA—V_SSA = 5.12 V
3. At V_REF = 5.12 V, one 8-bit count = 20 mV.
4. 8-bit absolute error of 1 count (20 mV) includes 1/2 count (10 mv) inherent quantization error and 1/2 count (10 mV) circuit
(differential, integral, and offset) error.
5. 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. Expected error in result
value due to junction leakage is expressed in voltage (V_ERRJ):
V_ERRJ = R_S × I_OFF
where I_OFF is a function of operating temperature. Charge-sharing effects with internal capacitors are a function of ATD
clock speed, the number of channels being scanned, and source impedance. For 8-bit conversions, charge pump leakage
is computed as follows:
V_ERRJ = .25 pF × V_DDA × R_S × ATDCLK/(8 × number of channels)
Advance Information
MOTOROLA
Electrical Characteristics
MC68HC812A4 — Rev. 3.0
327