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Maxim MAX12557 - page 1
General Description The MAX12557 is a dual 3.3V, 14-bit analog-to-digital converter (ADC) featuring fully differential wideband track-and-hold (T/H) inputs, driving internal quantizers. The MAX12557 is optimized for low power, small size, and high dynamic performance in intermediate frequen - cy (IF) and baseband sampling applications. This dual AD ...
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Maxim MAX12557 - page 2
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV ...
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Maxim MAX12557 - page 3
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV DD , PD = GND ...
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Maxim MAX12557 - page 4
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 4 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV DD , PD = GND ...
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Maxim MAX12557 - page 5
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC _______________________________________________________________________________________ 5 ELECTRICAL CHARACTERISTICS (continued) (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV DD , PD = GND ...
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Maxim MAX12557 - page 6
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 6 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV DD , PD = GND ...
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Maxim MAX12557 - page 7
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC _______________________________________________________________________________________ 7 ELECTRICAL CHARACTERISTICS (continued) (V DD = 3.3V, OV DD = 2.0V, GND = 0, REFIN = REFOUT (internal reference), C L ≈ 10pF at digital outputs, V IN = -0.5dBFS (differen- tial), DIFFCLK/ SECLK = OV DD , PD = GND ...
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Maxim MAX12557 - page 8
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 8 _______________________________________________________________________________________ -2.0 -1.0 -1.5 0 -0.5 0.5 1.0 1.5 2.0 0 4096 6144 2048 8192 10240 12288 14336 16384 INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE (4,194,304-POINT DATA RECORD) MAX12557 toc07 DIGITAL OUTPUT CODE INL (LSB) f IN = 3 ...
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Maxim MAX12557 - page 9
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC _______________________________________________________________________________________ 9 20 40 30 60 50 70 80 -55 -45 -40 -35 -50 -30 -25 -20 -15 -10 -5 0 MAX12557 toc13 A IN (dBFS) SNR, SINAD (dB) SNR, SINAD vs. ANALOG INPUT AMPLITUDE (f CLK = 65.00352MHz, f IN = 175MHz) SINAD SNR 35 55 45 75 65 85 9 ...
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Maxim MAX12557 - page 10
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 10 ______________________________________________________________________________________ 60 65 75 70 80 85 3.0 3.2 3.1 3.3 3.4 3.5 3.6 -THD, SFDR vs. ANALOG SUPPLY VOLTAGE (f CLK = 65.00352MHz, f IN = 175MHz) MAX12557 toc22 V DD (V) -THD, SFDR (dBc) SFDR -THD 60 64 72 68 76 80 1.5 2.1 1.8 2.4 2.7 3.0 ...
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Maxim MAX12557 - page 11
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC ______________________________________________________________________________________ 11 60 66 64 62 72 70 68 74 76 -40 10 -15 35 60 85 SNR, SINAD vs. TEMPERATURE (f IN = 175MHz, A IN = -0.5dBFS) MAX12557 toc31 TEMPERATURE ( ° C) SNR, SINAD (dB) SNR SINAD 60 70 65 80 75 85 90 -40 10 -15 35 60 85 -THD ...
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Maxim MAX12557 - page 12
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC 12 ______________________________________________________________________________________ PIN NAME FUNCTION 1, 4, 5, 9, 13, 14, 17 GND Converter Ground. Connect all ground pins and the exposed paddle (EP) together. 2 INAP Channel A Positive Analog Input 3 INAN Channel A Negative Analog Input 6 COMA Cha ...
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Maxim MAX12557 - page 13
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC ______________________________________________________________________________________ 13 PIN NAME FUNCTION 28 D0B Channel B CMOS Digital Output, Bit 0 (LSB) 29 D1B Channel B CMOS Digital Output, Bit 1 30 D2B Channel B CMOS Digital Output, Bit 2 31 D3B Channel B CMOS Digital Output, Bit 3 32 D4B Channe ...
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Maxim MAX12557 - page 14
MAX12557 Detailed Description The MAX12557 uses a 10-stage, fully differential, pipelined architecture (Figure 1) that allows for high- speed conversion while minimizing power consump- tion. Samples taken at the inputs move progressively through the pipeline stages every half clock cycle. From input to output the total latency is 8 clock cycles. Ea ...
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Maxim MAX12557 - page 15
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC ______________________________________________________________________________________ 15 INBP 14-BIT PIPELINE ADC DIGIT AL ERROR CORRECTION CHANNEL A REFERENCE SYSTEM COMA REF AN REF AP OV DD DA V OUTPUT DRIVERS DORA CLOCK DIVIDER D ATA FORMA T 14-BIT PIPELINE ADC DIGIT AL ERROR CORRECTION OUTPUT DRIV ...
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Maxim MAX12557 - page 16
MAX12557 Analog Inputs and Input Track-and-Hold (T/H) Amplifier Figure 3 displays a simplified functional diagram of the input T/H circuit. This input T/H circuit allows for high analog input frequencies of 175MHz and beyond and supports a V DD / 2 common-mode input voltage. The MAX12557 sampling clock controls the switched- capacitor input T/H arc ...
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Maxim MAX12557 - page 17
to GND. Bypass REF_P to REF_N with a 10µF capacitor. Bypass REFIN and REFOUT to GND with a 0.1µF capac- itor. The REFIN input impedance is very large (>50M Ω ). When driving REFIN through a resistive divider, use resistances ≥ 10k Ω to avoid loading REFOUT. Buffered external reference mode is virtually identical to the internal reference ...
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Maxim MAX12557 - page 18
MAX12557 select either one-half or one-fourth of the clock speed for sampling provides design flexibility, relaxes clock requirements, and can minimize clock jitter. System Timing Requirements Figure 5 shows the timing relationship between the clock, analog inputs, DAV indicator, DOR_ indicators, and the resulting output data. The analog input is s ...
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Maxim MAX12557 - page 19
externally isolates it from heavy capacitive loads. Refer to the MAX12557 EV kit schematic for recommendations of how to drive the DAV signal through an external buffer. Data Out-of-Range Indicator The DORA and DORB digital outputs indicate when the analog input voltage is out of range. When DOR_ is high, the analog input is out of range. When DOR_ ...
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Maxim MAX12557 - page 20
MAX12557 The digital outputs D0A/B–D13A/B are high impedance when the MAX12557 is in power-down (PD = 1) mode. D0A/B–D13A/B enter this state 10ns after the rising edge of PD and become active again 10ns after PD transitions low. Keep the capacitive load on the MAX12557 digital out- puts D0A/B–D13A/B as low as possible (<15pF) to avoid larg ...
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Maxim MAX12557 - page 21
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC ______________________________________________________________________________________ 21 BINARY -TO-GRA Y CODE CONVERSION 1) THE MOST SIGNIFICANT GRA Y -CODE BIT IS THE SAME AS THE MOST SIGNIFICANT BINARY BIT . 01 10 0100 1100 BINARY GRA Y CODE 0 2) SUBSEQUENT GRA Y -CODE BITS ARE FOUND ACCORDING TO T ...
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Maxim MAX12557 - page 22
MAX12557 Applications Information Using Transformer Coupling In general, the MAX12557 provides better SFDR and THD with fully differential input signals than single- ended input drive, especially for input frequencies above 125MHz. In differential input mode, even-order harmonics are lower as both inputs are balanced, and each of the ADC inputs onl ...
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Maxim MAX12557 - page 23
Buffered External Reference Drives Multiple ADCs The buffered external reference mode allows for more control over the MAX12557 reference voltage and allows multiple converters to use a common reference. The REFIN input impedance is >50M Ω . Figure 12 shows the MAX6029 precision 2.048V bandgap reference used as a common reference for multiple ...
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Maxim MAX12557 - page 24
MAX12557 ence, allowing REF_P, REF_N, and COM_ to be driven directly by a set of external reference sources. Figure 13 uses a MAX6029 precision 3.000V bandgap reference as a common reference for multiple convert- ers. A seven-component resistive divider chain follows the MAX6029 voltage reference. The 0.47µF capacitor along this chain creates a 10 ...
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Maxim MAX12557 - page 25
mount devices for minimum inductance. Bypass V DD to GND with a 220µF ceramic capacitor in parallel with at least one 10µF, one 4.7µF, and one 0.1µF ceramic capacitor. Bypass OV DD to GND with a 220µF ceramic capacitor in parallel with at least one 10µF, one 4.7µF, and one 0.1µF ceramic capacitor. High-frequency bypassing/decoupling capacit ...
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Maxim MAX12557 - page 26
MAX12557 Total Harmonic Distortion (THD) THD is the ratio of the RMS sum of the first six harmon- ics of the input signal to the fundamental itself. This is expressed as: where V 1 is the fundamental amplitude, and V 2 through V 7 are the amplitudes of the 2nd- through 7th-order harmonics (HD2 through HD7). Spurious-Free Dynamic Range (SFDR) SFDR i ...
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Maxim MAX12557 - page 27
Gain Matching Gain matching is a figure of merit that indicates how well the gains between the two channels are matched to each other. The same input signal is applied to both channels and the maximum deviation in gain is report- ed (typically in dB) as gain matching. Offset Matching Like gain matching, offset matching is a figure of merit that ind ...
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Maxim MAX12557 - page 28
MAX12557 Dual, 65Msps, 14-Bit, IF/Baseband ADC Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 28 ____________________Maxim Integrated Products ...
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