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SPT
2
3/3/98
SPT9712
ABSOLUTE MAXIMUM RATING (Beyond which damage may occur)1
Supply Voltages
Negative Supply Voltage (VEE) ................................ -7 V
A/D Ground Voltage Differential .............................. 0.5 V
Input Voltages
Digital Input Voltage (D1-D12, Latch Enable) .................
....................................................................... 0 V to VEE
Control Amp Input Voltage Range ................. 0 V to -4 V
Reference Input Voltage Range (VREF) ......... 0 V to VEE
Output Currents
Internal Reference Output Current ....................... 500
A
Control Amplifier Output Current ........................
±2.5 mA
Temperature
Operating Temperature .............................. -40 to +85
°C
Junction Temperature ......................................... +150
°C
Lead, Soldering (10 seconds) ............................. +300
°C
Storage ..................................................... -65 to +150
°C
Note: 1. Operation at any Absolute Maximum Ratings is not implied. See Electrical Specifications for proper nominal applied
conditions in typical applications.
1Gain is measured as a ratio of the full-scale current to ISET. The ratio is nominally 128.
2Measured as voltage at mid-scale transition to
±0.024%; RL=50 .
3Measured from the rising edge of Latch Enable to where the output signal has left a 1 LSB error band.
4Glitch is measured as the largest single transient.
5Calculated using IFS =128 x
Control Amp In
RSET
6SFDR is defined as the difference in signal energy between the fundamental and worst case spurious frequencies in the output
spectrum window, which is centered at the fundamental frequency and covers the indicated span.
DC Performance
Resolution
12
Bits
Differential Linearity
I
±0.5 ±0.75
±1.0 ±1.25 LSB
Differential Linearity
Max at Full Temp.
VI
±1.5
±2.0 LSB
Integral Linearity
Best Fit
I
±0.75
±1.0
±1.5 LSB
Integral Linearity
Max at Full Temp.
VI
±1.75
±2.0 LSB
Output Capacitance
+25
°C
V
10
pF
Gain Error1
+25
°C
I
1.0
5.0
1.0
5.0
% FS
Full Temp.
VI
8.0
% FS
Gain Error Tempco
Full Temp.
V
150
PPM/
°C
Zero-Scale Offset Error
+25
°C
I
0.5
2.5
0.5
2.5
A
Full Temp.
VI
5.0
A
Offset Drift Coefficient
Full Temp.
V
0.01
A/°C
Output Compliance Voltage
+25
°C
IV
-1.2
+2.0
-1.2
+2.0
V
Equivalent Output Resistance
+25
°C
IV
0.8
1.0
1.2
0.8
1.0
1.2
k
Dynamic Performance
Conversion Rate
+25
°C
IV
100
MWPS
Settling Time tST2
+25
°C
V
13
ns
Output Propagation Delay tD 3
+25
°CV
1
ns
Glitch Energy4
+25
°C
V
15
pV-s
Full Scale Output Current5
+25
°C
V
20.48
mA
Spurious-Free Dynamic Range6
+25
°C
1.23 MHz; 10 MWPS
2 MHz Span
V
70
dBc
5.055 MHz; 20 MWPS
2 MHz Span
V
68
dBc
10.1 MHz; 50 MWPS
2 MHz Span
V
68
dBc
16 MHz; 40 MWPS
10 MHz Span
V
68
dBc
Rise Time / Fall Time
RL = 50
V2
2
ns
ELECTRICAL SPECIFICATIONS
TA = TMIN - TMAX, VEE = -5.2 V, RSET = 7.5 k, Control Amp In = Ref Out, VOUT = 0 V, unless otherwise specified.
TEST
SPT9712A
SPT9712B
PARAMETERS
CONDITIONS
LEVEL
MIN
TYP
MAX
MIN
TYP
MAX
UNITS