DESCRIPTIO ®1416/LTC1419 are, respectively, 2µs, 400ksps 1µs, ksp
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DEMO MANUAL DC124 HIGH SPEED DEMO MANUAL DC124 LTC1416 (400ksps) LTC1419 (800ksps) 14-Bit Converters Demo Board
DESCRIPTIO
®1416/LTC1419 are, respectively, 2µs, 400ksps 1µs, ksps sampling converters. LTC1416 draws 75mW LTC1419 draws 150mW. LTC1416/LTC1419 demo board provides user with evaluate LTC1416 LTC1419 high speed converters. addition, LTC1416/LTC1419 demo board intended illustrate layout bypassing techniques required obtain optimum performance from this part. LTC1416/LTC1419 demo board designed easy requires only ±15V supplies, conversion start signal analog input signal (single-ended differential). shown Board Photo, LTC1416/LTC1419 very space efficient solutions users. combining 14-bit A/D, sample-and-hold reference into single package, data acquisition circuitry including bypass capacitors placed into area only inch2.
TYPICAL PERFOR CHARACTERISTICS BOARD PHOTO
4096 Point LTC1419 Demo Board
MAGNITUDE (dB)
-100 -110 100k 200k 300k 400k FREQUENCY (kHz) 500k 600k
052A TA01
This manual shows demo board. Included timing diagrams, power supply requirements analog input range information. Additionally, schematic, parts list, drawings dimensions board layers included. explanation layout bypass strategies used this board also included that anyone designing board using LTC1416/ LTC1419 will able maximum performance from device. Gerber files this circuit board available. Call factory. Some features this demo board include: Proven 400ksps (LTC1416) 800ksps (LTC1419) 14-bit surface mount layout Actual footprint only inch2 including bypass capacitors 79dB SINAD 86dB 200kHz (LTC1416) 400kHz (LTC1419) inputs
Component Side
+VIN -VIN CONFST LTC1419CS SHDN 74HC574 B[00:13] DGND AGND DVDD AVDD SHDN CONVST DATA READY VLOGIC 0.1µF HC14 HC14 HC14 HC14 15pF BUSY REFCOMP VREF -AIN +AIN 0.1µF LTC1419/LTC1416 74HC574 HC14 J6-13 J6-14 J6-11 J6-12 J6-9 J6-10 J6-7 J6-8 J6-5 J6-6 J6-3 J6-4 J6-1 J6-2 J6-15 J6-16 J6-17 J6-18 1.2k D[00:13] 1000pF VOUT PACKAGE 28-LEAD PLASTIC DGND 0.1µF
VLOGIC AGND 0.1µF 0.1µF REFCOMP BUSY
VOUT
-15V
TABGND
22µF
10µF
DGND DGND HEADER 18-PIN
DM124 SCHEM
DEMO MANUAL DC124
AGND
DGND
LT1363
1000pF
PACKAGE SCHEMATIC DIAGRAMS
1000pF
10µF
HC14
HC14
VLOGIC 10µF 10µF
JP5C
JP5B
JP5A
SHDN
NOTES: UNLESS OTHERWISE SPECIFIED RESISTOR VALUES OHMS, 1/10W, CAPACITOR VALUES 25V, 50V, THIS DEMO CIRCUIT AVAILABLE POWER VERSION LTC1416, DEMO NUMBER DC124A-L
SS12
79L05 SS12 22µF
VIEW +AIN +AVDD DVDD -AIN VREF
LTC1419 Demonstration Board Features Analog Input Signal Buffer, 800ksps, Parallel Data Output 14-bit ADC, Data Latches Binary Data Display. Latched Conversion Data Available 18-Pin Header,
LT1121-5
DEMO MANUAL DC124
PARTS LIST
REFERENCE DESIGNATOR C12, C14, D0-D13 D14, J1-J3 JP2-JP4 R0-R13 R15, R16, R17, QUANTITY PART NUMBER TAJC226M010R 08053C104MAT1A GRM235Y5V106Z016 08055A102KAT1A 0805YG105ZAT1A TAJB106M010R 08055A150KAT1A LN1215C- (TR) SS12-PKG11 575-4 112404 3201S-18G1 3801S-02G1 JL-100-25-T 3201S-06G1 CR21-122J-T CR21-200J-T CR21-510J-T CR21-103J-T CR21-105J-T CR21-102J-T MC79L05ACDR1 LT1121CST-5 LT1363CS8 LTC1419CSW LTC1416CSW MC74HC574DW MC74HC14AD CCIJ230-G 1902C DESCRIPTION Cap., Tantalum, 22µF, 10V, Cap., X7R, 0.1µF, 25V, Cap., Y5V, 10µF, 1000pF Capacitor Cap., Y5V, 1µF, Cap., Tantalum, 10µF, 10V, Cap., NPO, 15pF, 50V, LED., SMT, Red, 2.1V 15mA Diode, Schottky Connector, Banana Jack, Standard Connector, PCB-Vertical Connector, Header, 18-Pin 2-Row, 0.100cc Jumper, 2-Pin, 0.100cc, 0.025sq Jumper, Wire, 0.100cc, 22-AWG Jumper, 6-Pin, 2-Row, 0.100cc, 0.025sq Resistor, CHIP, 1.2k, 1/10W Resistor, CHIP, 1/10W Resistor, CHIP, 1/10W Resistor, CHIP, 10k, 1/10W Resistor, CHIP, 1/10W Resistor, CHIP, 1/10W SO-8, 79L05, Regulator SOT-224, Regulator SO-8, SO-28, 14-bit, SO-20, Octal Flip Flop SO-14, Inverter, Schmitt SHUNT, 0.100cc SCREW. #4-40, 1/4" STANDOFF, Nylon #4-40 1/2" VENDOR Murata Panasonic General Inst Keystone CONNEX COMM COMM Samtec COMM Motorola Motorola Motorola COMM Keystone TELEPHONE (803) 946-0690 (803) 946-0362 (814) 237-1431 (803) 946-0362 (803) 946-0362 (803) 946-0690 (803) 946-0362 (201) 348-5217 (516) 847-3000 (718) 956-8900 (805) 378-6464 (818) 301-4200 (818) 301-4200 (800) 726-8329 (818) 301-4200 (803) 946-0524 (803) 946-0524 (803) 946-0524 (803) 946-0524 (803) 946-0524 (803) 946-0524 (602) 655-3005 (408) 432-1900 (408) 432-1900 (408) 432-1900 (602) 655-3005 (602) 655-3005 (818) 301-4200 (718) 956-8900
OPERATIO
OPERATING BOARD Powering Board demo board, apply ±15V 200mA banana jacks (GND) careful observe correct polarity. Internal regulators provide LTC1416/LTC1419. LT1121-5 regulator (U2) provides analog digital circuitry provided buffer MC79L05 regulator (U1).
Analog Input LTC1416/LTC1419 have unique feature found previous ADCs: differential inputs with good common mode rejection from over 10MHz. While this feature extremely valuable rejecting noise measuring differential signals, board also used evaluate LTC1416/LTC1419 single-ended mode (with input grounded). This board allows evaluation either mode.
DEMO MANUAL DC124
OPERATIO
Differential (bipolar) analog signals applied LTC1416/LTC1419 demo board using connectors (non-inverting input) (inverting input). analog signal input range ±2.5V. LTC1416/LTC1419 +AIN (noninverting) (inverting) inputs have common mode range VDD. full-scale differential between signals applied +AIN ±2.5V. example, when 1.5V signal applied input, negative-to-positive fullscale input range +AIN corresponding output code 1000 0000 0000 0111 1111 1111. demo board delivered with jumpers closed. This configures board ±2.5V input signal centered around ground applied (+AIN). board includes recommended lowpass filter (R15, C11) across differential inputs. With component values shown, cutoff frequency (fs) 1.04MHz 2(102)(0.0015µF) These values altered meet other circuit input signal requirements. lower bandwidth input signals, increase value C11. undersampling applications that take advantage input circuitry's wide bandwidth, decrease capacitance C11. best observe performance LTC1416/ LTC1419 drive directly from impedance signal source. However, since some applications involve high output impedance sources, board also provisions onboard LT1363 high speed operational amplifier. LT1363, operating noninverter buffer, provides LTC1416/LTC1419 with fast settling, impedance signal that allows input voltage fully settle before starting conversion. buffer recommended source impedance input signal greater than 930. LT1363 demonstrates properly drive LTC1416/LTC1419. When using LT1363, open close JP3. Optimum performance achieved using signal source that output impedance, noise distortion. Signal generators, such Type 1051 Sine Generator, give excellent results. Further, this
generator configured operate referenced master clock signal, shown Figure Applying Conversion Start Signal conversion initiated falling edge CONVST input (BNC J7). CONVST input uses CMOS levels. shown Figure CONVST should remain until conversion completed returned high within 420ns negative going edge shown Figure
REFERENCE FREQUENCY BRUEL KJAER TYPE 1051 SINE GENERATOR LTC1416/ LTC1419 14-BIT DEMO BOARD HEWLETT PACKARD HP3326A REFERENCE GENERATOR FREQUENCY CLOCK 1-14 DOUT HEWLETT PACKARD HP1663A LOGIC ANALYZER CONVST
Figure Typical Setup LTC1419 Demo Board
CONVST
BUSY
DATA READY
Figure Timing Diagram
<420ns >40ns CONVST GOOD
BUSY
DATA READY
Figure Alternative Timing Diagram
DEMO MANUAL DC124
OPERATIO
During conversion, transitions CONVST input cause errors DOUT output. Reading Output Data data outputs buffered 74HC574 latches available connector latches drive LEDs connector practical circuit, latches required unless tied noisy data bus. (Refer LTC1416 LTC1419 data sheet details different digital interface modes.) output data format LTC1416/LTC1419 two's complement. data converted offset binary using instead D13. Offset binary used when performed sampled data. Data Ready line (J6, provided latch DOUT word. DOUT valid rising edge Data Ready. ground lines provided connector should connected receiving system. LTC1416/LTC1419 DOUT word acquired with logic analyzer. Conversion data stored disk easily transferred using logic analyzer that compatible floppy drive (such HP1663A). Once data transfered programs such MathCAD Excel calculate FFTs. FFTs obtain LTC1416/LTC1419 specifications, such signal-tonoise ratio total harmonic distortion. LEDs provide visual display LTC1416/ LTC1419 digital output word. display logic state MSB, respectively. Remove jumper disable LEDs, reducing supply consumption 37mA. Driving SHDN Pins Jumpers SHDN, (JP5A JP5C) shorted normal operation. jumpers removed these lines externally driven desired. LTC1416 LTC1419 data sheet details driving these lines.
LAYOUT well-designed printed circuit board layout incorporating LTC1416/LTC1419 uses separate analog digital ground planes. Except connecting them near U4's completely isolate ground planes from each other. Additionally, they should overlap they different printed circuit board layers. Connecting LTC1416/ LTC1419 analog (AGND) digital (DGND) pins analog ground plane ensures lowest noise operation. demonstration board layout (section titled "PCB Layout Film") shows best configure connect ground planes. ensure maximum ground plane efficiency, especially analog ground plane, important minimize plane-breaking traces. POWER SUPPLY CONNECTIONS BYPASSING Analog digital positive supply pins, AVDD DVDD respectively, connected device supply with single trace. negative supply (VSS) connected supply. best performance achieved careful attention proper bypassing. Bypass AVDD DVDD together analog ground plane with 10µF monolithic ceramic capacitor. Bypass analog ground plane with 10µF monolithic ceramic capacitor. internal voltage reference requires 10µF monolithic ceramic capacitor connected between REFCOMP analog ground plane. This bypass capacitor necessary because LTC1416/LTC1419 internal reference requires bypass capacitor least stable operation. Reference noise reduced even further using 0.1µF monolithic ceramic capacitor connected between VREF analog ground plane. with high accuracy, high resolution circuits, best performance achieved minimizing lead length bypass capacitors.
DEMO MANUAL DC124
Table Functional Description User Configurable Jumpers
JUMPER JP5A JP5B JP5C JUMPER NAME Enable +AIN Noninverting Input Buffer Bypass -AIN SHDN JUMPER CONNECTION Shorting Enables Operation. Opening Disables Operation Shorted Unbuffered Operation. Open When Using Noninverting Input Buffer. Open Normal Operation. Short Buffered Input Signals Open Shorted Single-Ended Operation. Open Differential Input Signals Shorted Normal Operation. Open Externally Drive SHDN with Logic Shutdown Mode with Logic High Normal Operation Shorted Normal Operation. Open Externally Drive Shorted Normal Operation. Open Externally Drive
Table Input Output Functional Description
INPUT/OUTPUT FUNCTION AGND (Mounting Hole) DGND (Mounting Hole) DGND (Mounting Hole) DGND (Mounting Hole) Negative Supply Voltage: -15V 100mA Supply Ground Positive Supply Voltage: 100mA +AIN, Noninverting Input: ±2.5V, Referenced -AIN. Input Voltage Range: AVDD (DVDD). -AIN, Inverting Input: ±2.5V, Referenced +AIN. Input Voltage Range: AVDD (DVDD). INPUT/OUTPUT J6-2 J6-3 J6-4 J6-5 J6-6 J6-7 J6-8 J6-9 J6-10 J6-11 J6-12 J6-13 J6-14 J6-15 J6-16 J6-17, FUNCTION (MSB) (MSB) Output (End Conversion) Digital Ground Convert Start:
J6-1
DEMO MANUAL DC124
LAYOUT
Component Side Silkscreen
Component Side Mask
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
Component Side Solder Side
DEMO MANUAL DC124
DRAWI
3.500
NOTES: UNLESS OTHERWISE SPECIFIED. FINISHED MATERIAL FR4, 0.062" THICK, COPPER WILL DOUBLE-SIDED WITH PLATED THROUGH HOLES SIZES AFTER PLATING, 0.001" WALL THICKNESS PADMASTER PROCESS SOLDER MASK BOTH SIDES USING PC401 EQUIVALENT SILKSCREEN COMPONENT SIDE USING WHITE NONCONDUCTIVE DIMENSIONS INCHES, ±0.005" HOLE SIZES AFTER PLATING,
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417 (408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
3.500
0.200
0.200
FABRICATION DRAWING COPPER LAYER
LINEAR TECHNOLOGY LTC1419/1416, DC124A/-L
SYMBOL NONE
DIAMETER 0.010 0.015 0.031 0.040 0.052 0.120 0.070 0.209 TOTAL HOLES
NUMBER HOLES
124A
dc124f PDI/LT/GP 0197 PRINTED
LINEAR TECHNOLOGY CORPORATION 1997
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