N
Comlinear CLC935
12-bit, 15MSPS A/D Converter
General Description
The Comlinear CLC935 is a high-speed high-performance 12-bit Analog-to-Digital converter. the CLC935 is a complete A/D subsystem, including 12-bit quantizer, track-and-hold, and references. The ECL compatible A/D has maximum sample rates of 15MSPS, allowing the user to digitize high-speed signals accurately.
The CLC935 has excellent dynamic performance characteristics which are thoroughly tested to insure that system performance goals will be met. Sampling at 15MSPS with a 400kHz input signal, the CLC935 achieves a typical 82dBc SFDR and an SNR of 65.5dB. Sampling a 5MHz signal can be done with 78dB of SFDR.
The CLC935 incorporates a complete two-pass architecture which is constructed from high-speed IC’s on a thin-film substrate. Critical DC parameters are laser trimmed to assure accurate part-to-part matching. A CONVERT clock, power, and an analog input signal are all that are required for CLC935 operation.
The CLC935-BC part is specified over the commercial temperature range, while the CLC935-B8C part is an extended temperature range, high reliability version. Both parts are packaged in 40pin, 1.1 inch wide, ceramic DIPs with side-brazed leads for easy access and inspection.
August 1996
Not Intended For New Designs
Features
■Wide Dynamic Range
82dB SFDR; Fin = 400kHz
81dB IMD; Fin = 3.5MHz & 3.7MHz 82dB SNR; Fin = 7MHz
■Fast recovery time
■0.6 LSB differential linearity error
Applications
■Electronic imaging
■Digital communications
■IF sampling
■Radar processing
■FLIR processing
■Instrumentation
A/D 15MSPS bit,-12 |
CLC935 Comlinear |
Converter |
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© 1996 National Semiconductor Corporation |
http://www.national.com |
Printed in the U.S.A.
CLC935 Electrical Characteristics (VCC = +5V, V1 = +15V, -V2 = -15V; VEE = -5.2V; |
unless specified) |
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PARAMETERS |
CONDITIONS |
TYP |
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MIN/MAX RATINGS |
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UNITS |
NOTES |
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CLC935 |
25° |
25° |
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0° to +70° |
-55° to +125° |
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DYNAMIC CHARACTERISTICS |
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small signal bandwidth |
VIN = 1/4 FS |
150 |
100 |
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100 |
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100 |
MHz |
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large signal bandwidth |
VIN = FS |
130 |
80 |
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80 |
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80 |
MHz |
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slew rate |
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450 |
300 |
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300 |
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300 |
V/ms |
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overvoltage recovery time |
VIN = 2FS |
14 |
25 |
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25 |
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25 |
ns |
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effective aperture delay |
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-0.4 |
-1.5 |
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-2.0 |
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-2.0 |
ns |
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aperture jitter |
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1.67 |
2.5 |
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3.0 |
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3.0 |
ps(rms) |
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NOISE and DISTORTION (15MSPS) |
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signal-to-noise ratio (not including harmonics) |
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404kHz; |
FS |
65.6 |
63 |
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63 |
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61 |
dB |
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4.984MHz; |
FS |
65.4 |
63 |
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63 |
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61 |
dB |
A,B |
7.225MHz; FS |
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65.2 |
63 |
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63 |
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61 |
dB |
A,B |
in-band harmonics |
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404kHz; |
FS-1dB |
-82.3 |
-74 |
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-72 |
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-70 |
dBc |
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4.984MHz; |
FS-1dB |
-78.1 |
-70 |
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-68 |
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-64 |
dBc |
A |
7.225MHz; |
FS-1dB |
-74.2 |
-68 |
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-66 |
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-62 |
dBc |
A |
intermodulation distortion |
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f1 = 3.49MHz @ FS-7dB; f2 = 3.7MHz @ FS-7dB |
-81.2 |
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dBc |
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noise-power-ratio |
FS-12dB |
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dc to 5MHz white noise; 2.7MHz notch |
51.0 |
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dB |
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DC ACCURACY and PERFORMANCE |
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differential non-linearity |
dc; FS |
0.6 |
1.0 |
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1.0 |
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1.0 |
LSB |
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integral non-linearity |
dc; FS |
1.3 |
3.0 |
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3.0 |
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3.0 |
LSB |
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missing codes |
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0 |
0 |
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0 |
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0 |
codes |
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bipolar offset error |
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3.0 |
15 |
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25 |
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40 |
mV |
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temperature coefficient |
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250 |
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250 |
mV/°C |
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bipolar gain error |
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2.0 |
5.0 |
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5.0 |
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5.0 |
%FS |
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temperature coefficient |
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0.05 |
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0.05 |
%FS/°C |
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ANALOG INPUT PERFORMANCE |
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analog input bias current |
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10 |
25 |
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35 |
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45 |
mA |
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temperature coefficient |
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100 |
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250 |
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250 |
nA/°C |
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analog input resistance |
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80 |
25 |
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25 |
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25 |
kW |
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analog input capacitance |
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3.5 |
5.5 |
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5.5 |
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5.5 |
pF |
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DIGITAL INPUTS |
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input voltage |
logic LOW |
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-1.5 |
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-1.5 |
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-1.5 |
V |
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logic HIGH |
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-1.1 |
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-1.1 |
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-1.1 |
V |
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input current |
logic LOW |
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1.0 |
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1.0 |
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1.0 |
mA |
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logic HIGH |
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1.0 |
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1.0 |
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1.0 |
mA |
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DIGITAL OUTPUTS |
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output voltage |
logic LOW |
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-1.5 |
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-1.5 |
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-1.5 |
V |
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logic HIGH |
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-1.1 |
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-1.1 |
-1.1 |
V |
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TIMING |
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maximum conversion rate |
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15 |
15 |
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15 |
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15 |
MSPS |
A,B,C |
minimum conversion rate |
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0 |
0 |
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0 |
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0 |
MSPS |
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data hold time |
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6.0 |
4.0 |
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3.0 |
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3.0 |
ns |
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POWER REQUIREMENTS |
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supply current (+VCC = +5.0V) |
15MSPS |
146 |
175 |
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175 |
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175 |
mA |
A,B,C |
supply current (-VEE = -5.2V) |
15MSPS |
647 |
750 |
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750 |
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750 |
mA |
A,B,C |
supply current (+V1 = +15.0V) |
15MSPS |
16 |
20 |
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20 |
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20 |
mA |
A,B,C |
supply current (-V2 = -15.0V) |
15MSPS |
28 |
35 |
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35 |
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35 |
mA |
A,B,C |
nominal power dissipation |
15MSPS |
4.75 |
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W |
PD |
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Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters.
Test Notes |
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Test Level |
A)Specification is 100% tested.
Military units are tested at -55°C, +25°C, +125°C; Commercial units are tested at 25°C, guaranteed at 0° & 70°C.
B)Specifications are GROUP A inspection test.
C)Specification is 100% tested.
Military units are tested at -55°C, +25°C, +125°C.
Test levels are derived from mil spec SUBGROUPS.
Static Tests |
1) +25°C |
2) |
+125°C |
3) -55°C |
Dynamic Tests |
4) +25°C |
5) |
+125°C |
6) -55°C |
Functional Tests |
7) +25°C 8) |
+125°C and -55°C |
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Switching Tests |
9) +25°C |
10) +125°C |
11) -55°C |
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Note: Junction temperature rise above case = 16°C; θCA = 16°C/W; θCA = 7°C/W @ 500LFPM. Use of a CHO-THERM® #T274, or similar product from Chemetrics (1-800-225-1936), can lower case-to-ambient rise.
http://www.national.com |
2 |
CLC935 Typical Performance Characteristics (Tc = 35°C; 15MSPS)
3 |
http://www.national.com |
Recommended Operation Conditions°
positive supply voltage (+VCC) |
+5V |
±5% |
positive supply voltage (+V1) |
+15V |
±5% |
negative supply voltage (-VEE) |
-5.2V ±5% |
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negative supply voltage (-V1) |
-15V |
±5% |
differential voltage between any two GND’s |
<10mV |
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analog input voltage range (Full Scale) |
±1.0V |
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digital input voltage range |
-2.0V to 0.0V |
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*Note: Absolute maximum ratings are limiting values, to be applied individually, and beyond which the serviceability of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied. Exposure to maximum ratings for extended periods may affect device reliability.
Absolute Maximum Ratings*
positive supply voltage (+VCC) |
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-0.5 to +7.0V |
positive supply voltage (+V1) |
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-0.5 to +18V |
negative supply voltage (-VEE) |
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+0.5 to -7.0V |
negative supply voltage (-V1) |
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+0.5 to -18.0V |
differential voltage between any two GND’s |
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200mV |
analog input voltage range |
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-VEE to +VCC |
digital input voltage range |
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+0.5V to -VEE |
gain adjust voltage range |
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-VEE to +VCC |
output short circuit duration (one pin to ground) |
Infinite |
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junction temperature |
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+175°C |
operating temperature range |
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CLC935-BC |
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0°C to +70°C |
CLC935-B8C |
-55°C to +125°C |
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storage temperature range |
-65°C to +150°C |
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lead solder duration (+300°C) |
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10 sec |
Pinout & Pin Description and Usage
GROUND |
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1 |
40 |
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SIGNAL GROUND |
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+Vcc, +5.0V |
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2 |
39 |
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VIN |
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-Vee, -5.2V |
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3 |
38 |
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SIGNAL GROUND |
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DNC |
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4 |
37 |
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OFFSET ADJUST |
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DNC |
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5 |
36 |
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OFFSET REF |
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(INVERTED MSB) |
D1 |
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6 |
35 |
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VREFOUT (+2.5V) |
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(MSB) D1 |
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7 |
34 |
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+15V |
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D2 |
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8 |
33 |
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GAIN ADJUST |
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D3 |
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9 |
32 |
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-15V |
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D4 |
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10 |
31 |
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-Vee, -5.2V |
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D5 |
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11 |
30 |
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GROUND |
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D6 |
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12 |
29 |
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DNC |
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D7 |
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13 |
28 |
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DNC |
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D8 |
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14 |
27 |
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-Vee, -5.2V |
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D9 |
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15 |
26 |
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-Vcc, +5.0V |
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D10 |
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16 |
25 |
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DATA INV. |
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D11 |
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17 |
24 |
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CONVERT |
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(LSB) D12 |
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18 |
23 |
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CONVERT |
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DNC |
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19 |
22 |
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-Vee, -5.2V |
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DNC |
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20 |
21 |
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GROUND |
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ECL-Level Digital Inputs
■CONVERT, CONVERT (Pins 23, 24) : “Differential Convert Command” initiates a new conversion cycle on the rising edge of CONVERT.
■DATA INV (Pin 25): DATA INVERT is an active HIGH (grounded) ECL input which causes the data outputs [D1 to D12] to be inverted. In normal operation, DATA INV is left floating or tied to ECL logic LOW.
ECL-Level Digital Outputs (Note: all ECL digital outputs have internal series resistances such that Zout = 50Ω ±3 Ω)
■(MSB) D1-D12 (Pins 7 to 18): Digital Data Outputs. D1 is the MSB; D12 is the LSB. In their normal state, the digital outputs offer Offset Binary output coding.
■(MSB) D1 (Pin 6): Inverted version of the MSB, used for 2’s Complement coding.
Analog Input
■VIN (Pin 39): Analog input with a 2.0Vpp input range from +1.00V to -1.00V.
■GAIN ADJUST (Pin 33): The GAIN ADJUST has a +4V to +1V input range and scales the analog input full-
scale range by -10% to +10% respectively. If unused, Gain Adjust should be left floating.
Miscellaneous
■ VREF (+2.5V) (Pin 35): VREF is a highly stable +2.500V voltage reference. (Recommended current drain ≤ 2mA.)
■D.N.C (Pins 4, 5, 19, 20, 28, 29): Do Not Connect.
■OFFSET ADJUST (Pin 36): OFFSET ADJUST has a GROUND to OFFSET REFERENCE input range and scales the analog input offset by Ò0.1V. If unused, OFFSET ADJUST should be left floating.
■OFFSET REFERENCE (Pin 37): OFFSET REFERENCE tracks gain adjustments and is used for offset
voltage adjustment.
Power and Ground
■ +5V, Pins 2,26; +15V, Pin 34; -5.2V, Pins 3, 22, 27, 31; -15V, Pin 32; GROUND, Pins 1, 21, 30, 38, 40.
http://www.national.com |
4 |
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