ICL8052 Datasheet, PDF (21/21 Pages) Intersil Corporation – 14-Bit/16-Bit, Microprocessor- Compatible, 2-Chip, A/D Converter

ICL8052/ICL7104, ICL8068/ICL7104
ICL7104 with ICL8052/8068 Integrating A/D Converter Equations
• Oscillator
CRYSTAL or RC (RC on -14 Part Only)
f_OSC (Typ) 200kHz
f_OSC = 0.45/RC (ICL7104-14 Only)
C_OSC > 50pF and R_OSC > 50K
• Oscillator Period
t_OSC = 1/f_OSC
• Integration Clock Frequency
f_CLOCK = f_OSC
• Integration Period
t_INT = 8192 x t_OSC (7104-14)
t_INT = 32768 x t_OSC (7104-16)
• 60/50Hz Rejection Criterion
t_INT/t_60Hz or t_INT/t_50Hz = Integer
• Optimum Integration Current
I_INT = 20µA
• Full Scale Analog Input Voltage
V_INFS (Typ) = 200mV to 2V = 2V_REF
• Integrate Resistor
R_INT = -⁽--^B----^u----^f--^f--^e----^r---^G----_I-^a-_I-_N--ⁱ-ⁿ--_T--⁾----^×-----^V----^I--^N----^F---^S--
• Integrate Capacitor
C_INT = ⁽---^t--^I--^N---_V-^T---_I-⁾-_N-⁽--^I-_T-^I--^N----^T----⁾
• Integrator Output Voltage
V_INT = ⁽---^t--^I--^N---_C-^T---_I-⁾-_N-⁽--^I-_T-^I--^N----^T----⁾
V_INT (Typ) = 9V
• Output Count
Count = 8192 × _V---^V--_R---^I-_EN----_F- (7104-14)
Count = 32768 × _V---^V--_R---^I-_EN----_F- (7104-16)
• Output Type:
Binary Amplitude with Polarity and Overrange Bits.
• Power Supply: ±15V, +5V
V++ = +15V
V- = -15V
V+ = +5V
V_REF ≅ 1.75V
If V_REF not used, float output pin.
• Auto Zero Capacitor Values
0.01µF < C_AZ < 1µF
• Reference Capacitor Value
C_REF = (Buffer Gain) x C_AZ
ICL7104 - 14
ICL7104 - 16
AUTOZERO
(COUNT)
24,576 - 8,193
98,304 - 32,769
INTEGRATE
(FIXED COUNT)
8192
32768
DEINTEGRATE
(COUNT)
0 - 16383
0 - 65535
CONVERSION TIME (IN CONTINUOUS MODE):
32,768 † t_OSC (7104 - 14)
131,072 † t_OSC (7104 - 16)
FIGURE 17.
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